diff --git a/libraries/config.default.php b/libraries/config.default.php
index dc082746d..b2a393275 100644
--- a/libraries/config.default.php
+++ b/libraries/config.default.php
@@ -2329,7 +2329,7 @@ $cfg['ErrorIconic'] = true;
 $cfg['MainPageIconic'] = true;
 
 /**
- * show help button instead of strDocu (true|false)?
+ * show help button instead of Documentation text (true|false)?
  *
  * @global boolean $cfg['ReplaceHelpImg']
  */
diff --git a/libraries/messages.inc.php b/libraries/messages.inc.php
index cb192d2ea..786424d45 100644
--- a/libraries/messages.inc.php
+++ b/libraries/messages.inc.php
@@ -18,8 +18,6 @@ $charset = 'utf-8';
 /* l10n: Text direction, use either ltr or rtl */
 $text_dir = __('ltr');
 
-$strDocu = __('Documentation');
-
 $strLatexContent = __('Content of table __TABLE__');
 $strLatexContinued = __('(continued)');
 $strLatexStructure = __('Structure of table __TABLE__');