diff --git a/core/includes/file.inc b/core/includes/file.inc
index 3cd9439..65f0197 100644
--- a/core/includes/file.inc
+++ b/core/includes/file.inc
@@ -31,6 +31,7 @@
 
 /**
  * @defgroup file File interface
+ * @ingroup file
  * @{
  * Common file handling functions.
  */