diff --git a/phpBB/phpbb/avatar/manager.php b/phpBB/phpbb/avatar/manager.php
index f2bb1a5dbe..90cd83898f 100644
--- a/phpBB/phpbb/avatar/manager.php
+++ b/phpBB/phpbb/avatar/manager.php
@@ -180,8 +180,8 @@ class manager
 	/**
 	* Strip out user_, group_, or other prefixes from array keys
 	*
-	* @param array	$row User data or group data
-	* @param string $prefix Prefix of data keys
+	* @param array	$row			User data or group data
+	* @param string $prefix			Prefix of data keys (e.g. user), should not include the trailing underscore
 	*
 	* @return array User data or group data with keys that have been
 	*        stripped from the preceding "user_" or "group_"
@@ -205,8 +205,11 @@ class manager
 	/**
 	* Strip prepending user_ or group_ prefix from key
 	*
-	* @param string Array key
-	* @return void
+	* @param string		$key		Array key
+	* @param string		$null	Parameter is ignored by the function, just required by the array_walk
+	* @param string		$prefix		Prefix that should be stripped off from the keys (e.g. user)
+	*								Should not include the trailing underscore
+	* @return	null
 	*/
 	static protected function strip_prefix(&$key, $null, $prefix)
 	{