diff --git a/_locales/ja/messages.json b/_locales/ja/messages.json
index 41617c0f..32f2fb2e 100644
--- a/_locales/ja/messages.json
+++ b/_locales/ja/messages.json
@@ -670,6 +670,10 @@
 		"message": "（次のようにルールを設定してください: 0=無効, 1=警告, 2=エラー）",
 		"description": "CSSLint rule config values"
 	},
+	"usercssReplaceTemplateSectionBody": {
+		"message": "ここにコードを挿入...",
+		"description": "The code placeholder comment in a new style created by clicking 'Write style' in the popup"
+	},
 	"searchResultNoneFound": {
 		"message": "該当するスタイルはありません。",
 		"description": "Error text in the popup when inline search didn't find any site-specific styles"