diff --git a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
index 218aa673..c39ff118 100644
--- a/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
+++ b/packages/squiggle-lang/src/rescript/Reducer/Reducer_Dispatch/Reducer_Dispatch_BuiltIn.res
@@ -281,12 +281,12 @@ let callInternal = (call: functionCall, environment, reducer: ExpressionT.reduce
   | ("$_typeModifier_opaque_$", [EvRecord(typeRecord)]) => typeModifier_opaque_update(typeRecord)
   | ("$_typeOr_$", [EvArray(arr)]) => typeOr(EvArray(arr))
   | ("$_typeFunction_$", [EvArray(arr)]) => typeFunction(arr)
-  | ("add", [EvArray(aValueArray), EvArray(bValueArray)]) => doAddArray(aValueArray, bValueArray)
-  | ("add", [EvString(aValueString), EvString(bValueString)]) =>
+  | ("concat", [EvArray(aValueArray), EvArray(bValueArray)]) => doAddArray(aValueArray, bValueArray)
+  | ("concat", [EvString(aValueString), EvString(bValueString)]) =>
     doAddString(aValueString, bValueString)
   | ("inspect", [value, EvString(label)]) => inspectLabel(value, label)
   | ("inspect", [value]) => inspect(value)
-  | ("keep", [EvArray(aValueArray), EvLambda(aLambdaValue)]) =>
+  | ("filter", [EvArray(aValueArray), EvLambda(aLambdaValue)]) =>
     doKeepArray(aValueArray, aLambdaValue)
   | ("map", [EvArray(aValueArray), EvLambda(aLambdaValue)]) => doMapArray(aValueArray, aLambdaValue)
   | ("mapSamples", [EvDistribution(SampleSet(dist)), EvLambda(aLambdaValue)]) =>
diff --git a/packages/website/docs/Api/DistPointSet.mdx b/packages/website/docs/Api/DistPointSet.md
similarity index 100%
rename from packages/website/docs/Api/DistPointSet.mdx
rename to packages/website/docs/Api/DistPointSet.md
diff --git a/packages/website/docs/Api/DistSampleSet.md b/packages/website/docs/Api/DistSampleSet.md
new file mode 100644
index 00000000..b9a722d4
--- /dev/null
+++ b/packages/website/docs/Api/DistSampleSet.md
@@ -0,0 +1,67 @@
+---
+sidebar_position: 4
+title: Sample Set Distribution
+---
+
+### make
+```
+SampleSet.make: (distribution) => sampleSet
+SampleSet.make: (() => number) => sampleSet
+SampleSet.make: (list<number>) => sampleSet
+```
+
+
+
+### kde
+```
+SampleSet.kde: (sampleSet) => pointSetDist
+```
+
+
+
+### toEmpiricalPdf
+```
+SampleSet.toEmpiricalPdf: (sampleSet) => pointSetDist
+```
+
+
+
+### map
+```
+SampleSet.map: (sampleSet, (number => number)) => sampleSet
+```
+
+
+
+### map2
+```
+SampleSet.map2: (sampleSet, sampleSet, ((number, number) => number)) => sampleSet
+```
+
+
+
+### map3
+```
+SampleSet.map3: (sampleSet, sampleSet, sampleSet, ((number, number, number) => number)) => sampleSet
+```
+
+
+
+### correlation
+```
+SampleSet.correlation: (sampleSet, sampleSet) => number
+```
+
+
+
+### toInternalSampleArray
+```
+SampleSet.toInternalSampleArray: (sampleSet) => list<number>
+```
+Gets the internal samples of a sampleSet distribution. This is separate from the sampleN() function, which would shuffle the samples. toInternalSampleArray() maintains order and length.Gets the internal samples of a sampleSet distribution. This is separate from the sampleN() function, which would shuffle the samples. toInternalSampleArray() maintains order and length.
+
+
+**Examples**
+```
+toInternalSampleArray(toSampleSet(normal(5,2)))
+```
\ No newline at end of file
diff --git a/packages/website/docs/Api/DistSampleSet.mdx b/packages/website/docs/Api/DistSampleSet.mdx
deleted file mode 100644
index 282d5d64..00000000
--- a/packages/website/docs/Api/DistSampleSet.mdx
+++ /dev/null
@@ -1,67 +0,0 @@
----
-sidebar_position: 4
-title: Sample Set Distribution
----
-
-### make
-```javascript
-make: (distribution) => sampleSet
-make: (() => number) => sampleSet
-make: (list<number>) => sampleSet
-```
-
-
-
-### kde
-```javascript
-kde: (sampleSet) => pointSetDist
-```
-
-
-
-### toEmpiricalPdf
-```javascript
-toEmpiricalPdf: (sampleSet) => pointSetDist
-```
-
-
-
-### map
-```javascript
-map: (sampleSet, (number => number)) => sampleSet
-```
-
-
-
-### map2
-```javascript
-map2: (sampleSet, sampleSet, ((number, number) => number)) => sampleSet
-```
-
-
-
-### map3
-```javascript
-map3: (sampleSet, sampleSet, sampleSet, ((number, number, number) => number)) => sampleSet
-```
-
-
-
-### correlation
-```javascript
-correlation: (sampleSet, sampleSet) => number
-```
-
-
-
-### toInternalSampleArray
-```javascript
-toInternalSampleArray: (sampleSet) => list<number>
-```
-Gets the internal samples of a sampleSet distribution. This is separate from the sampleN() function, which would shuffle the samples. toInternalSampleArray() maintains order and length.
-
-
-**Examples**
-```javascript
-toInternalSampleArray(toSampleSet(normal(5,2)))
-```
\ No newline at end of file
diff --git a/packages/website/docs/Api/Duration.mdx b/packages/website/docs/Api/Duration.md
similarity index 100%
rename from packages/website/docs/Api/Duration.mdx
rename to packages/website/docs/Api/Duration.md
diff --git a/packages/website/docs/Api/List.md b/packages/website/docs/Api/List.md
new file mode 100644
index 00000000..ef2e537e
--- /dev/null
+++ b/packages/website/docs/Api/List.md
@@ -0,0 +1,179 @@
+---
+sidebar_position: 6
+title: List
+---
+
+## make
+```
+List.make: (number, 'a) => list<'a>
+List.make: (number, number => a) => list<'a>
+List.make: (pointSetDist) => list<number>
+```
+
+
+
+### toString
+```
+List.toString: (list<'a>) => string
+```
+
+
+
+### length
+```
+List.length: (list<'a>) => number
+```
+
+
+
+### get
+```
+List.get: (list<'a>, number) => 'a
+```
+
+
+
+### find
+```
+List.find: (list<'a>, 'a => bool) => 'a
+```
+
+
+
+### filter
+```
+List.filter: (list<'a>, 'a => bool) => 'a
+```
+
+
+
+### set
+```
+List.set: (list<'a>, number, 'a) => 'a
+```
+
+
+
+### shuffle
+```
+List.shuffle: (list<'a>) => list<'a>
+```
+
+
+
+### reverse
+```
+List.reverse: (list<'a>) => list<'a>
+```
+
+
+
+### range
+```
+List.range: (low:number, high:number, increment?:number=1.0) => list<number>
+```
+
+
+
+### zip
+```
+List.zip: (list<'a>, list<'b>) => list<list<'a|b>>
+```
+
+
+
+### unzip
+```
+List.unzip: (list<list<'a|b>>) => list<list<'a>, list<'b>>
+```
+
+
+
+### concat
+```
+List.concat: (list<'a>, list<'b>) => list<'a|b>
+```
+
+
+
+### concatMany
+```
+List.concatMany: (list<list<'a>>) => list<'a>
+```
+
+
+
+### slice
+```
+List.slice: 
+```
+
+
+
+### map
+```
+List.map: (list<'a>, a => b) => list<'b>
+```
+
+
+
+### reduce
+```
+List.reduce: 
+```
+
+
+
+### reduceRight
+```
+List.reduceRight: 
+```
+
+
+
+### includes
+```
+List.includes: (list<'a>, 'a => bool) => boolean
+```
+
+
+
+### every
+```
+List.every: (list<'a>, 'a => bool) => boolean
+```
+
+
+
+### truncate
+```
+List.truncate: (list<'a>, number) => list<'a>
+```
+
+
+
+### uniq
+```
+List.uniq: (list<'a>) => list<'a>
+```
+
+
+
+### first
+```
+List.first: (list<'a>) => 'a
+```
+
+
+
+### last
+```
+List.last: (list<'a>) => 'a
+```
+
+
+
+### sort
+```
+List.sort: (list<'a>) => list<'a>
+```
\ No newline at end of file
diff --git a/packages/website/docs/Api/List.mdx b/packages/website/docs/Api/List.mdx
deleted file mode 100644
index 9fb5f326..00000000
--- a/packages/website/docs/Api/List.mdx
+++ /dev/null
@@ -1,176 +0,0 @@
----
-sidebar_position: 6
-title: List
----
-
-### make
-```javascript
-make: (number, 'a) => list<'a> (number, number => a) => list<'a> (pointSetDist) => list<number>
-```
-
-
-
-### toString
-```typescript
-toString: (list<'a>) => string
-```
-
-
-
-### length
-```typescript
-length: (list<'a>) => number
-```
-
-
-
-### get
-```typescript
-get: (list<'a>, number) => 'a
-```
-
-
-
-### find
-```typescript
-find: (list<'a>, 'a => bool) => 'a
-```
-
-
-
-### filter
-```typescript
-filter: (list<'a>, 'a => bool) => 'a
-```
-
-
-
-### set
-```typescript
-set: (list<'a>, number, 'a) => 'a
-```
-
-
-
-### shuffle
-```typescript
-shuffle: (list<'a>) => list<'a>
-```
-
-
-
-### reverse
-```typescript
-reverse: (list<'a>) => list<'a>
-```
-
-
-
-### range
-```typescript
-range: (low:number, high:number, increment?:number=1.0) => list<number>
-```
-
-
-
-### zip
-```typescript
-zip: (list<'a>, list<'b>) => list<list<'a|b>>
-```
-
-
-
-### unzip
-```typescript
-unzip: (list<list<'a|b>>) => list<list<'a>, list<'b>>
-```
-
-
-
-### concat
-```typescript
-concat: (list<'a>, list<'b>) => list<'a|b>
-```
-
-
-
-### concatMany
-```typescript
-concatMany: (list<list<'a>>) => list<'a>
-```
-
-
-
-### slice
-```typescript
-slice: 
-```
-
-
-
-### map
-```typescript
-map: (list<'a>, a => b) => list<'b>
-```
-
-
-
-### reduce
-```typescript
-reduce: 
-```
-
-
-### reduceRight
-```typescript
-reduceRight: 
-```
-
-
-
-### includes
-```typescript
-includes: (list<'a>, 'a => bool) => boolean
-```
-
-
-
-### every
-```typescript
-every: (list<'a>, 'a => bool) => boolean
-```
-
-
-
-### truncate
-```typescript
-truncate: (list<'a>, number) => list<'a>
-```
-
-
-
-### uniq
-```typescript
-uniq: (list<'a>) => list<'a>
-```
-
-
-
-### first
-```typescript
-first: (list<'a>) => 'a
-```
-
-
-
-### last
-```typescript
-last: (list<'a>) => 'a
-```
-
-
-
-### sort
-```typescript
-sort: (list<'a>) => list<'a>
-```
\ No newline at end of file
diff --git a/packages/website/docs/Api/Math.mdx b/packages/website/docs/Api/Math.md
similarity index 100%
rename from packages/website/docs/Api/Math.mdx
rename to packages/website/docs/Api/Math.md
diff --git a/packages/website/docs/Api/Number.mdx b/packages/website/docs/Api/Number.md
similarity index 100%
rename from packages/website/docs/Api/Number.mdx
rename to packages/website/docs/Api/Number.md