diff --git a/common/comment.ts b/common/comment.ts
index c1b721cc..c7f9b855 100644
--- a/common/comment.ts
+++ b/common/comment.ts
@@ -1,15 +1,11 @@
 import type { JSONContent } from '@tiptap/core'
 
+export type AnyCommentType = OnContract | OnGroup
+
 // Currently, comments are created after the bet, not atomically with the bet.
 // They're uniquely identified by the pair contractId/betId.
-export type Comment = {
+export type Comment<T extends AnyCommentType = AnyCommentType> = {
   id: string
-  commentType: 'contract' | 'group'
-
-  contractId?: string
-  groupId?: string
-  betId?: string
-  answerOutcome?: string
   replyToCommentId?: string
   userId: string
 
@@ -22,6 +18,21 @@ export type Comment = {
   userName: string
   userUsername: string
   userAvatarUrl?: string
-  contractSlug?: string
-  contractQuestion?: string
+} & T
+
+type OnContract = {
+  commentType: 'contract'
+  contractId: string
+  contractSlug: string
+  contractQuestion: string
+  answerOutcome?: string
+  betId?: string
 }
+
+type OnGroup = {
+  commentType: 'group'
+  groupId: string
+}
+
+export type ContractComment = Comment<OnContract>
+export type GroupComment = Comment<OnGroup>
diff --git a/functions/src/on-create-comment-on-contract.ts b/functions/src/on-create-comment-on-contract.ts
index 3fa0983d..9f19dfcc 100644
--- a/functions/src/on-create-comment-on-contract.ts
+++ b/functions/src/on-create-comment-on-contract.ts
@@ -2,7 +2,7 @@ import * as functions from 'firebase-functions'
 import * as admin from 'firebase-admin'
 import { compact, uniq } from 'lodash'
 import { getContract, getUser, getValues } from './utils'
-import { Comment } from '../../common/comment'
+import { ContractComment } from '../../common/comment'
 import { sendNewCommentEmail } from './emails'
 import { Bet } from '../../common/bet'
 import { Answer } from '../../common/answer'
@@ -29,7 +29,7 @@ export const onCreateCommentOnContract = functions
       contractQuestion: contract.question,
     })
 
-    const comment = change.data() as Comment
+    const comment = change.data() as ContractComment
     const lastCommentTime = comment.createdTime
 
     const commentCreator = await getUser(comment.userId)
@@ -64,7 +64,7 @@ export const onCreateCommentOnContract = functions
           : undefined
     }
 
-    const comments = await getValues<Comment>(
+    const comments = await getValues<ContractComment>(
       firestore.collection('contracts').doc(contractId).collection('comments')
     )
     const relatedSourceType = comment.replyToCommentId
diff --git a/functions/src/on-create-comment-on-group.ts b/functions/src/on-create-comment-on-group.ts
index 0064480f..15f2bbc1 100644
--- a/functions/src/on-create-comment-on-group.ts
+++ b/functions/src/on-create-comment-on-group.ts
@@ -1,5 +1,5 @@
 import * as functions from 'firebase-functions'
-import { Comment } from '../../common/comment'
+import { GroupComment } from '../../common/comment'
 import * as admin from 'firebase-admin'
 import { Group } from '../../common/group'
 import { User } from '../../common/user'
@@ -14,7 +14,7 @@ export const onCreateCommentOnGroup = functions.firestore
       groupId: string
     }
 
-    const comment = change.data() as Comment
+    const comment = change.data() as GroupComment
     const creatorSnapshot = await firestore
       .collection('users')
       .doc(comment.userId)
diff --git a/web/components/comments-list.tsx b/web/components/comments-list.tsx
index 94799f4e..280787dd 100644
--- a/web/components/comments-list.tsx
+++ b/web/components/comments-list.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useState } from 'react'
 
-import { Comment } from 'common/comment'
+import { Comment, ContractComment } from 'common/comment'
 import { groupConsecutive } from 'common/util/array'
 import { getUsersComments } from 'web/lib/firebase/comments'
 import { SiteLink } from './site-link'
@@ -16,12 +16,6 @@ import { LoadingIndicator } from './loading-indicator'
 
 const COMMENTS_PER_PAGE = 50
 
-type ContractComment = Comment & {
-  contractId: string
-  contractSlug: string
-  contractQuestion: string
-}
-
 function contractPath(slug: string) {
   // by convention this includes the contract creator username, but we don't
   // have that handy, so we just put /market/
@@ -38,7 +32,9 @@ export function UserCommentsList(props: { user: User }) {
   useEffect(() => {
     getUsersComments(user.id).then((cs) => {
       // we don't show comments in groups here atm, just comments on contracts
-      setComments(cs.filter((c) => c.contractId) as ContractComment[])
+      setComments(
+        cs.filter((c) => c.commentType == 'contract') as ContractComment[]
+      )
     })
   }, [user.id])
 
diff --git a/web/components/contract/contract-leaderboard.tsx b/web/components/contract/contract-leaderboard.tsx
index 6f1a778d..22175876 100644
--- a/web/components/contract/contract-leaderboard.tsx
+++ b/web/components/contract/contract-leaderboard.tsx
@@ -1,5 +1,5 @@
 import { Bet } from 'common/bet'
-import { Comment } from 'common/comment'
+import { ContractComment } from 'common/comment'
 import { resolvedPayout } from 'common/calculate'
 import { Contract } from 'common/contract'
 import { formatMoney } from 'common/util/format'
@@ -65,7 +65,7 @@ export function ContractLeaderboard(props: {
 export function ContractTopTrades(props: {
   contract: Contract
   bets: Bet[]
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
 }) {
   const { contract, bets, comments, tips } = props
diff --git a/web/components/contract/contract-tabs.tsx b/web/components/contract/contract-tabs.tsx
index eb455df0..9e9f62bf 100644
--- a/web/components/contract/contract-tabs.tsx
+++ b/web/components/contract/contract-tabs.tsx
@@ -1,6 +1,6 @@
 import { Bet } from 'common/bet'
 import { Contract } from 'common/contract'
-import { Comment } from 'web/lib/firebase/comments'
+import { ContractComment } from 'common/comment'
 import { User } from 'common/user'
 import { ContractActivity } from '../feed/contract-activity'
 import { ContractBetsTable, BetsSummary } from '../bets-list'
@@ -15,7 +15,7 @@ export function ContractTabs(props: {
   contract: Contract
   user: User | null | undefined
   bets: Bet[]
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
 }) {
   const { contract, user, bets, tips } = props
diff --git a/web/components/feed/activity-items.ts b/web/components/feed/activity-items.ts
index 511767c6..bcbb6721 100644
--- a/web/components/feed/activity-items.ts
+++ b/web/components/feed/activity-items.ts
@@ -3,7 +3,7 @@ import { uniq, sortBy } from 'lodash'
 import { Answer } from 'common/answer'
 import { Bet } from 'common/bet'
 import { getOutcomeProbability } from 'common/calculate'
-import { Comment } from 'common/comment'
+import { ContractComment } from 'common/comment'
 import { Contract, FreeResponseContract } from 'common/contract'
 import { User } from 'common/user'
 import { CommentTipMap } from 'web/hooks/use-tip-txns'
@@ -28,7 +28,7 @@ type BaseActivityItem = {
 export type CommentInputItem = BaseActivityItem & {
   type: 'commentInput'
   betsByCurrentUser: Bet[]
-  commentsByCurrentUser: Comment[]
+  commentsByCurrentUser: ContractComment[]
 }
 
 export type DescriptionItem = BaseActivityItem & {
@@ -50,8 +50,8 @@ export type BetItem = BaseActivityItem & {
 
 export type CommentThreadItem = BaseActivityItem & {
   type: 'commentThread'
-  parentComment: Comment
-  comments: Comment[]
+  parentComment: ContractComment
+  comments: ContractComment[]
   tips: CommentTipMap
   bets: Bet[]
 }
@@ -60,7 +60,7 @@ export type AnswerGroupItem = BaseActivityItem & {
   type: 'answergroup'
   user: User | undefined | null
   answer: Answer
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
   bets: Bet[]
 }
@@ -84,7 +84,7 @@ export type LiquidityItem = BaseActivityItem & {
 function getAnswerAndCommentInputGroups(
   contract: FreeResponseContract,
   bets: Bet[],
-  comments: Comment[],
+  comments: ContractComment[],
   tips: CommentTipMap,
   user: User | undefined | null
 ) {
@@ -116,7 +116,7 @@ function getAnswerAndCommentInputGroups(
 
 function getCommentThreads(
   bets: Bet[],
-  comments: Comment[],
+  comments: ContractComment[],
   tips: CommentTipMap,
   contract: Contract
 ) {
@@ -135,7 +135,7 @@ function getCommentThreads(
   return items
 }
 
-function commentIsGeneralComment(comment: Comment, contract: Contract) {
+function commentIsGeneralComment(comment: ContractComment, contract: Contract) {
   return (
     comment.answerOutcome === undefined &&
     (contract.outcomeType === 'FREE_RESPONSE'
@@ -147,7 +147,7 @@ function commentIsGeneralComment(comment: Comment, contract: Contract) {
 export function getSpecificContractActivityItems(
   contract: Contract,
   bets: Bet[],
-  comments: Comment[],
+  comments: ContractComment[],
   liquidityProvisions: LiquidityProvision[],
   tips: CommentTipMap,
   user: User | null | undefined,
diff --git a/web/components/feed/contract-activity.tsx b/web/components/feed/contract-activity.tsx
index cd490701..3cc0acb0 100644
--- a/web/components/feed/contract-activity.tsx
+++ b/web/components/feed/contract-activity.tsx
@@ -1,5 +1,5 @@
 import { Contract } from 'web/lib/firebase/contracts'
-import { Comment } from 'web/lib/firebase/comments'
+import { ContractComment } from 'common/comment'
 import { Bet } from 'common/bet'
 import { useBets } from 'web/hooks/use-bets'
 import { getSpecificContractActivityItems } from './activity-items'
@@ -12,7 +12,7 @@ import { LiquidityProvision } from 'common/liquidity-provision'
 export function ContractActivity(props: {
   contract: Contract
   bets: Bet[]
-  comments: Comment[]
+  comments: ContractComment[]
   liquidityProvisions: LiquidityProvision[]
   tips: CommentTipMap
   user: User | null | undefined
diff --git a/web/components/feed/feed-answer-comment-group.tsx b/web/components/feed/feed-answer-comment-group.tsx
index edaf1fe5..86686f1f 100644
--- a/web/components/feed/feed-answer-comment-group.tsx
+++ b/web/components/feed/feed-answer-comment-group.tsx
@@ -1,6 +1,6 @@
 import { Answer } from 'common/answer'
 import { Bet } from 'common/bet'
-import { Comment } from 'common/comment'
+import { ContractComment } from 'common/comment'
 import React, { useEffect, useState } from 'react'
 import { Col } from 'web/components/layout/col'
 import { Row } from 'web/components/layout/row'
@@ -24,7 +24,7 @@ export function FeedAnswerCommentGroup(props: {
   contract: any
   user: User | undefined | null
   answer: Answer
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
   bets: Bet[]
 }) {
@@ -69,7 +69,7 @@ export function FeedAnswerCommentGroup(props: {
   ])
 
   const scrollAndOpenReplyInput = useEvent(
-    (comment?: Comment, answer?: Answer) => {
+    (comment?: ContractComment, answer?: Answer) => {
       setReplyToUser(
         comment
           ? { id: comment.userId, username: comment.userUsername }
diff --git a/web/components/feed/feed-comments.tsx b/web/components/feed/feed-comments.tsx
index d4ba98b6..0541a7ba 100644
--- a/web/components/feed/feed-comments.tsx
+++ b/web/components/feed/feed-comments.tsx
@@ -1,5 +1,5 @@
 import { Bet } from 'common/bet'
-import { Comment } from 'common/comment'
+import { ContractComment } from 'common/comment'
 import { User } from 'common/user'
 import { Contract } from 'common/contract'
 import React, { useEffect, useState } from 'react'
@@ -32,9 +32,9 @@ import { Editor } from '@tiptap/react'
 
 export function FeedCommentThread(props: {
   contract: Contract
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
-  parentComment: Comment
+  parentComment: ContractComment
   bets: Bet[]
   smallAvatar?: boolean
 }) {
@@ -50,7 +50,7 @@ export function FeedCommentThread(props: {
   )
   commentsList.unshift(parentComment)
 
-  function scrollAndOpenReplyInput(comment: Comment) {
+  function scrollAndOpenReplyInput(comment: ContractComment) {
     setReplyToUser({ id: comment.userId, username: comment.userUsername })
     setShowReply(true)
   }
@@ -95,10 +95,10 @@ export function FeedCommentThread(props: {
 
 export function CommentRepliesList(props: {
   contract: Contract
-  commentsList: Comment[]
+  commentsList: ContractComment[]
   betsByUserId: Dictionary<Bet[]>
   tips: CommentTipMap
-  scrollAndOpenReplyInput: (comment: Comment) => void
+  scrollAndOpenReplyInput: (comment: ContractComment) => void
   bets: Bet[]
   treatFirstIndexEqually?: boolean
   smallAvatar?: boolean
@@ -156,12 +156,12 @@ export function CommentRepliesList(props: {
 
 export function FeedComment(props: {
   contract: Contract
-  comment: Comment
+  comment: ContractComment
   tips: CommentTips
   betsBySameUser: Bet[]
   probAtCreatedTime?: number
   smallAvatar?: boolean
-  onReplyClick?: (comment: Comment) => void
+  onReplyClick?: (comment: ContractComment) => void
 }) {
   const {
     contract,
@@ -274,7 +274,7 @@ export function FeedComment(props: {
 
 export function getMostRecentCommentableBet(
   betsByCurrentUser: Bet[],
-  commentsByCurrentUser: Comment[],
+  commentsByCurrentUser: ContractComment[],
   user?: User | null,
   answerOutcome?: string
 ) {
@@ -319,7 +319,7 @@ function CommentStatus(props: {
 export function CommentInput(props: {
   contract: Contract
   betsByCurrentUser: Bet[]
-  commentsByCurrentUser: Comment[]
+  commentsByCurrentUser: ContractComment[]
   replyToUser?: { id: string; username: string }
   // Reply to a free response answer
   parentAnswerOutcome?: string
diff --git a/web/components/feed/find-active-contracts.ts b/web/components/feed/find-active-contracts.ts
index c53b3622..ad2af970 100644
--- a/web/components/feed/find-active-contracts.ts
+++ b/web/components/feed/find-active-contracts.ts
@@ -1,6 +1,6 @@
 import { groupBy, mapValues, maxBy, sortBy } from 'lodash'
 import { Contract } from 'web/lib/firebase/contracts'
-import { Comment } from 'web/lib/firebase/comments'
+import { ContractComment } from 'common/comment'
 import { Bet } from 'common/bet'
 
 const MAX_ACTIVE_CONTRACTS = 75
@@ -19,7 +19,7 @@ function lastActivityTime(contract: Contract) {
 // - Bet on market
 export function findActiveContracts(
   allContracts: Contract[],
-  recentComments: Comment[],
+  recentComments: ContractComment[],
   recentBets: Bet[],
   seenContracts: { [contractId: string]: number }
 ) {
@@ -73,7 +73,7 @@ export function findActiveContracts(
   )
   const contractMostRecentComment = mapValues(
     contractComments,
-    (comments) => maxBy(comments, (c) => c.createdTime) as Comment
+    (comments) => maxBy(comments, (c) => c.createdTime) as ContractComment
   )
 
   const prioritizedContracts = sortBy(activeContracts, (c) => {
diff --git a/web/components/groups/group-chat.tsx b/web/components/groups/group-chat.tsx
index a37377a5..781705c2 100644
--- a/web/components/groups/group-chat.tsx
+++ b/web/components/groups/group-chat.tsx
@@ -4,7 +4,8 @@ import { PrivateUser, User } from 'common/user'
 import React, { useEffect, memo, useState, useMemo } from 'react'
 import { Avatar } from 'web/components/avatar'
 import { Group } from 'common/group'
-import { Comment, createCommentOnGroup } from 'web/lib/firebase/comments'
+import { Comment, GroupComment } from 'common/comment'
+import { createCommentOnGroup } from 'web/lib/firebase/comments'
 import { CommentInputTextArea } from 'web/components/feed/feed-comments'
 import { track } from 'web/lib/service/analytics'
 import { firebaseLogin } from 'web/lib/firebase/users'
@@ -24,7 +25,7 @@ import { setNotificationsAsSeen } from 'web/pages/notifications'
 import { usePrivateUser } from 'web/hooks/use-user'
 
 export function GroupChat(props: {
-  messages: Comment[]
+  messages: GroupComment[]
   user: User | null | undefined
   group: Group
   tips: CommentTipMap
@@ -58,7 +59,7 @@ export function GroupChat(props: {
   // array of groups, where each group is an array of messages that are displayed as one
   const groupedMessages = useMemo(() => {
     // Group messages with createdTime within 2 minutes of each other.
-    const tempGrouped: Comment[][] = []
+    const tempGrouped: GroupComment[][] = []
     for (let i = 0; i < messages.length; i++) {
       const message = messages[i]
       if (i === 0) tempGrouped.push([message])
@@ -193,7 +194,7 @@ export function GroupChat(props: {
 }
 
 export function GroupChatInBubble(props: {
-  messages: Comment[]
+  messages: GroupComment[]
   user: User | null | undefined
   privateUser: PrivateUser | null | undefined
   group: Group
@@ -309,7 +310,7 @@ function GroupChatNotificationsIcon(props: {
 
 const GroupMessage = memo(function GroupMessage_(props: {
   user: User | null | undefined
-  comments: Comment[]
+  comments: GroupComment[]
   group: Group
   onReplyClick?: (comment: Comment) => void
   setRef?: (ref: HTMLDivElement) => void
diff --git a/web/components/tipper.tsx b/web/components/tipper.tsx
index dbacbee9..b9ebdefc 100644
--- a/web/components/tipper.tsx
+++ b/web/components/tipper.tsx
@@ -42,6 +42,10 @@ export function Tipper(prop: { comment: Comment; tips: CommentTips }) {
         return
       }
 
+      const contractId =
+        comment.commentType === 'contract' ? comment.contractId : undefined
+      const groupId =
+        comment.commentType === 'group' ? comment.groupId : undefined
       await transact({
         amount: change,
         fromId: user.id,
@@ -50,18 +54,14 @@ export function Tipper(prop: { comment: Comment; tips: CommentTips }) {
         toType: 'USER',
         token: 'M$',
         category: 'TIP',
-        data: {
-          contractId: comment.contractId,
-          commentId: comment.id,
-          groupId: comment.groupId,
-        },
+        data: { commentId: comment.id, contractId, groupId },
         description: `${user.name} tipped M$ ${change} to ${comment.userName} for a comment`,
       })
 
       track('send comment tip', {
-        contractId: comment.contractId,
         commentId: comment.id,
-        groupId: comment.groupId,
+        contractId,
+        groupId,
         amount: change,
         fromId: user.id,
         toId: comment.userId,
diff --git a/web/hooks/use-comments.ts b/web/hooks/use-comments.ts
index 7d644444..172d2cee 100644
--- a/web/hooks/use-comments.ts
+++ b/web/hooks/use-comments.ts
@@ -1,13 +1,13 @@
 import { useEffect, useState } from 'react'
+import { Comment, ContractComment, GroupComment } from 'common/comment'
 import {
-  Comment,
   listenForCommentsOnContract,
   listenForCommentsOnGroup,
   listenForRecentComments,
 } from 'web/lib/firebase/comments'
 
 export const useComments = (contractId: string) => {
-  const [comments, setComments] = useState<Comment[] | undefined>()
+  const [comments, setComments] = useState<ContractComment[] | undefined>()
 
   useEffect(() => {
     if (contractId) return listenForCommentsOnContract(contractId, setComments)
@@ -16,7 +16,7 @@ export const useComments = (contractId: string) => {
   return comments
 }
 export const useCommentsOnGroup = (groupId: string | undefined) => {
-  const [comments, setComments] = useState<Comment[] | undefined>()
+  const [comments, setComments] = useState<GroupComment[] | undefined>()
 
   useEffect(() => {
     if (groupId) return listenForCommentsOnGroup(groupId, setComments)
diff --git a/web/lib/firebase/comments.ts b/web/lib/firebase/comments.ts
index f0678367..f7c947fe 100644
--- a/web/lib/firebase/comments.ts
+++ b/web/lib/firebase/comments.ts
@@ -11,7 +11,7 @@ import {
 import { getValues, listenForValues } from './utils'
 import { db } from './init'
 import { User } from 'common/user'
-import { Comment } from 'common/comment'
+import { Comment, ContractComment, GroupComment } from 'common/comment'
 import { removeUndefinedProps } from 'common/util/object'
 import { track } from '@amplitude/analytics-browser'
 import { JSONContent } from '@tiptap/react'
@@ -31,7 +31,8 @@ export async function createCommentOnContract(
   const ref = betId
     ? doc(getCommentsCollection(contractId), betId)
     : doc(getCommentsCollection(contractId))
-  const comment: Comment = removeUndefinedProps({
+  // contract slug and question are set via trigger
+  const comment = removeUndefinedProps({
     id: ref.id,
     commentType: 'contract',
     contractId,
@@ -60,7 +61,7 @@ export async function createCommentOnGroup(
   replyToCommentId?: string
 ) {
   const ref = doc(getCommentsOnGroupCollection(groupId))
-  const comment: Comment = removeUndefinedProps({
+  const comment = removeUndefinedProps({
     id: ref.id,
     commentType: 'group',
     groupId,
@@ -96,7 +97,7 @@ export async function listAllComments(contractId: string) {
 }
 
 export async function listAllCommentsOnGroup(groupId: string) {
-  const comments = await getValues<Comment>(
+  const comments = await getValues<GroupComment>(
     getCommentsOnGroupCollection(groupId)
   )
   comments.sort((c1, c2) => c1.createdTime - c2.createdTime)
@@ -105,9 +106,9 @@ export async function listAllCommentsOnGroup(groupId: string) {
 
 export function listenForCommentsOnContract(
   contractId: string,
-  setComments: (comments: Comment[]) => void
+  setComments: (comments: ContractComment[]) => void
 ) {
-  return listenForValues<Comment>(
+  return listenForValues<ContractComment>(
     getCommentsCollection(contractId),
     (comments) => {
       comments.sort((c1, c2) => c1.createdTime - c2.createdTime)
@@ -117,9 +118,9 @@ export function listenForCommentsOnContract(
 }
 export function listenForCommentsOnGroup(
   groupId: string,
-  setComments: (comments: Comment[]) => void
+  setComments: (comments: GroupComment[]) => void
 ) {
-  return listenForValues<Comment>(
+  return listenForValues<GroupComment>(
     getCommentsOnGroupCollection(groupId),
     (comments) => {
       comments.sort((c1, c2) => c1.createdTime - c2.createdTime)
diff --git a/web/pages/[username]/[contractSlug].tsx b/web/pages/[username]/[contractSlug].tsx
index 94773b6d..41ad5957 100644
--- a/web/pages/[username]/[contractSlug].tsx
+++ b/web/pages/[username]/[contractSlug].tsx
@@ -17,7 +17,7 @@ import {
 import { SEO } from 'web/components/SEO'
 import { Page } from 'web/components/page'
 import { Bet, listAllBets } from 'web/lib/firebase/bets'
-import { Comment, listAllComments } from 'web/lib/firebase/comments'
+import { listAllComments } from 'web/lib/firebase/comments'
 import Custom404 from '../404'
 import { AnswersPanel } from 'web/components/answers/answers-panel'
 import { fromPropz, usePropz } from 'web/hooks/use-propz'
@@ -38,6 +38,7 @@ import { CommentTipMap, useTipTxns } from 'web/hooks/use-tip-txns'
 import { useSaveReferral } from 'web/hooks/use-save-referral'
 import { getOpenGraphProps } from 'web/components/contract/contract-card-preview'
 import { User } from 'common/user'
+import { ContractComment } from 'common/comment'
 import { listUsers } from 'web/lib/firebase/users'
 import { FeedComment } from 'web/components/feed/feed-comments'
 import { Title } from 'web/components/title'
@@ -78,7 +79,7 @@ export default function ContractPage(props: {
   contract: Contract | null
   username: string
   bets: Bet[]
-  comments: Comment[]
+  comments: ContractComment[]
   slug: string
   backToHome?: () => void
 }) {
@@ -314,7 +315,7 @@ function ContractLeaderboard(props: { contract: Contract; bets: Bet[] }) {
 function ContractTopTrades(props: {
   contract: Contract
   bets: Bet[]
-  comments: Comment[]
+  comments: ContractComment[]
   tips: CommentTipMap
 }) {
   const { contract, bets, comments, tips } = props
diff --git a/web/pages/group/[...slugs]/index.tsx b/web/pages/group/[...slugs]/index.tsx
index c5255974..2ee9fa49 100644
--- a/web/pages/group/[...slugs]/index.tsx
+++ b/web/pages/group/[...slugs]/index.tsx
@@ -46,7 +46,7 @@ import { ENV_CONFIG } from 'common/envs/constants'
 import { useSaveReferral } from 'web/hooks/use-save-referral'
 import { Button } from 'web/components/button'
 import { listAllCommentsOnGroup } from 'web/lib/firebase/comments'
-import { Comment } from 'common/comment'
+import { GroupComment } from 'common/comment'
 import { GroupChat } from 'web/components/groups/group-chat'
 
 export const getStaticProps = fromPropz(getStaticPropz)
@@ -123,7 +123,7 @@ export default function GroupPage(props: {
   topTraders: User[]
   creatorScores: { [userId: string]: number }
   topCreators: User[]
-  messages: Comment[]
+  messages: GroupComment[]
 }) {
   props = usePropz(props, getStaticPropz) ?? {
     group: null,