diff --git a/src/editor/lsp/language.ts b/src/editor/lsp/language.ts
index 6f1ff10e1..7291f1a7c 100644
--- a/src/editor/lsp/language.ts
+++ b/src/editor/lsp/language.ts
@@ -9,6 +9,7 @@ import { LanguageServerClient } from '.'
 import { kclPlugin } from './plugin'
 import type * as LSP from 'vscode-languageserver-protocol'
 import { parser as jsParser } from '@lezer/javascript'
+import { EditorState } from '@uiw/react-codemirror'
 
 const data = defineLanguageFacet({})
 
@@ -22,7 +23,25 @@ export default function kclLanguage(options: LanguageOptions): LanguageSupport {
   // For now let's use the javascript parser.
   // It works really well and has good syntax highlighting.
   // We can use our lsp for the rest.
-  const lang = new Language(data, jsParser, [], 'kcl')
+  const lang = new Language(
+    data,
+    jsParser,
+    [
+      EditorState.languageData.of(() => [
+        {
+          // https://codemirror.net/docs/ref/#commands.CommentTokens
+          commentTokens: {
+            line: '//',
+            block: {
+              open: '/*',
+              close: '*/',
+            },
+          },
+        },
+      ]),
+    ],
+    'kcl'
+  )
 
   // Create our supporting extension.
   const kclLsp = kclPlugin({