diff --git a/languages.json b/languages.json
index 2d969d8b2..1e0506f13 100644
--- a/languages.json
+++ b/languages.json
@@ -601,7 +601,7 @@
     "GlimmerJs": {
       "name": "Glimmer JS",
       "line_comment": ["//"],
-      "multi_line_comments": [["/*", "*/"], ["<!--", "-->"], ["{{!", "}}"]],
+      "multi_line_comments": [["/*", "*/"], ["<!--", "-->"]],
       "quotes": [["\\\"", "\\\""], ["'", "'"], ["`", "`"]],
       "important_syntax": ["<template", "<style"],
       "extensions": ["gjs"]
@@ -609,7 +609,7 @@
     "GlimmerTs": {
       "name": "Glimmer TS",
       "line_comment": ["//"],
-      "multi_line_comments": [["/*", "*/"], ["<!--", "-->"], ["{{!", "}}"]],
+      "multi_line_comments": [["/*", "*/"], ["<!--", "-->"]],
       "quotes": [["\\\"", "\\\""], ["'", "'"], ["`", "`"]],
       "important_syntax": ["<template", "<style"],
       "extensions": ["gts"]
diff --git a/tests/data/glimmer_js.gjs b/tests/data/glimmer_js.gjs
index 84191186e..d4ea20851 100644
--- a/tests/data/glimmer_js.gjs
+++ b/tests/data/glimmer_js.gjs
@@ -1,4 +1,4 @@
-// 28 lines, 18 code, 7 comments, 4 blanks
+// 27 lines, 18 code, 6 comments, 3 blanks
 import { helper } from '@ember/component/helper';
 import { modifier } from 'ember-modifier';
 
@@ -14,7 +14,6 @@ const setScrollPosition = modifier((element, [position]) => {
 
 <template>
   <!-- A HTML-like comment -->
-  {{!-- But also glimmer handlebars-like comments are valid in the template --}}
   <div class="scroll-container" {{setScrollPosition @scrollPos}}>
     {{#each @items as |item index|}}
       Item #{{plusOne index}}: {{item}}
diff --git a/tests/data/glimmer_ts.gts b/tests/data/glimmer_ts.gts
index 532f50463..e0ad163df 100644
--- a/tests/data/glimmer_ts.gts
+++ b/tests/data/glimmer_ts.gts
@@ -1,4 +1,4 @@
-// 19 lines, 10 code, 7 comments, 3 blanks
+// 18 lines, 10 code, 6 comments, 2 blanks
 import type { TemplateOnlyComponent } from '@glimmer/component';
 
 // A single-line comment
@@ -9,7 +9,6 @@ const localVariable = 'foo';
  */
 const Greet: TemplateOnlyComponent<{ name: string }> = <template>
   <!-- A HTML-like comment -->
-  {{!-- But also glimmer handlebars-like comments are valid in the template --}}
   <p>Hello, {{@name}}! {{localVariable}}</p>
   <style>
     p {