diff --git a/src/Plugin/CKEditorPlugin/CodeSnippet.php b/src/Plugin/CKEditorPlugin/CodeSnippet.php
index 21e1cc428dae26324372eac8c19ab8f8dc905d0b..e10e420b2b2e8f12b1096efa760da726ce0e42f2 100644
--- a/src/Plugin/CKEditorPlugin/CodeSnippet.php
+++ b/src/Plugin/CKEditorPlugin/CodeSnippet.php
@@ -142,6 +142,12 @@ class CodeSnippet extends CKEditorPluginBase implements CKEditorPluginConfigurab
    * Unlike getDefaultLanguages(), this provides human friendly names for
    * languages (ex. C++ instead of cpp).
    *
+   * These languages are provided as options by the module because these are the
+   * languages that come with HighlightJS in the CodeSnippet CKEditor plugin.
+   *
+   * To add more languages, users can easily implement hook_form_alter() and add
+   * to the options array.
+   *
    * @return array
    */
   private function getLanguages() {