diff --git a/fckeditor.config.js b/fckeditor.config.js
index f6c5efbf532543637bbfe8a4ec31c5d287ecf281..491fe2fe6951e62acd133ac174adf7ea7668c81c 100644
--- a/fckeditor.config.js
+++ b/fckeditor.config.js
@@ -16,6 +16,10 @@ FCKConfig.ToolbarSets["DrupalBasic"] = [
 	['FontFormat','-','Bold','Italic','-','OrderedList','UnorderedList','-','Link','Unlink', 'Image']
 ] ;
 
-// uncomment this line if you want to enable php code in your content
-//FCKConfig.ProtectedSource.Add( /<\?[\s\S]*?\?>/g ) ;	// PHP style server side code
+// Protect PHP code tags (<?...?>) so FCKeditor will not break them when
+// switching from Source to WYSIWYG.
+// Uncomment this line doesn't mean the user will not be able to type PHP
+// code in the source. This kind of prevention must be done in the server side
+// (as does Drupal), so just leave this line as is.
+FCKConfig.ProtectedSource.Add( /<\?[\s\S]*?\?>/g ) ;	// PHP style server side code