diff --git a/lib/outputlib.php b/lib/outputlib.php
index d73a6346bb9..cd3776a90a6 100644
--- a/lib/outputlib.php
+++ b/lib/outputlib.php
@@ -184,7 +184,7 @@ class theme_config {
      * how you want that type of page to look. For example
      * <pre>
      *   $THEME->layouts = array(
-     *       // Most pages - if we encounter an unknown or amissing page type, this one is used.
+     *       // Most pages - if we encounter an unknown or a missing page type, this one is used.
      *       'standard' => array(
      *           'theme' = 'mytheme',
      *           'file' => 'normal.php',