diff --git a/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor-debug.js b/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor-debug.js
index 2e137381d6d..3191c1eb817 100644
--- a/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor-debug.js
+++ b/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor-debug.js
@@ -1796,6 +1796,7 @@ EditorClean.prototype = {
 
         // Use a regular expression to find the next open or close li, ul, or ol tag.
         // Keep going until there are no more matching tags left.
+        // This expression looks for whole words by employing the word boundary (\b) metacharacter.
         while ((match = toProcess.match(/<(\/?)(li|ul|ol)\b[^>]*>/i))) {
             currentTag = {
                 tag: match[2],
diff --git a/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor.js b/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor.js
index 215a2b7fe8e..9efdd37a6ca 100644
--- a/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor.js
+++ b/lib/editor/atto/yui/build/moodle-editor_atto-editor/moodle-editor_atto-editor.js
@@ -1783,6 +1783,7 @@ EditorClean.prototype = {
 
         // Use a regular expression to find the next open or close li, ul, or ol tag.
         // Keep going until there are no more matching tags left.
+        // This expression looks for whole words by employing the word boundary (\b) metacharacter.
         while ((match = toProcess.match(/<(\/?)(li|ul|ol)\b[^>]*>/i))) {
             currentTag = {
                 tag: match[2],
diff --git a/lib/editor/atto/yui/src/editor/js/clean.js b/lib/editor/atto/yui/src/editor/js/clean.js
index 44f65e8fd1f..abdc3ac5dee 100644
--- a/lib/editor/atto/yui/src/editor/js/clean.js
+++ b/lib/editor/atto/yui/src/editor/js/clean.js
@@ -498,6 +498,7 @@ EditorClean.prototype = {
 
         // Use a regular expression to find the next open or close li, ul, or ol tag.
         // Keep going until there are no more matching tags left.
+        // This expression looks for whole words by employing the word boundary (\b) metacharacter.
         while ((match = toProcess.match(/<(\/?)(li|ul|ol)\b[^>]*>/i))) {
             currentTag = {
                 tag: match[2],