6 files changed, 9 insertions, 9 deletions
diff --git a/phpBB/includes/acm/acm_apc.php b/phpBB/includes/acm/acm_apc.php
index 1a487f94ad..205353d3a5 100644
--- a/phpBB/includes/acm/acm_apc.php
+++ b/phpBB/includes/acm/acm_apc.php
@@ -33,7 +33,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/acm/acm_eaccelerator.php b/phpBB/includes/acm/acm_eaccelerator.php
index 645067c199..ecec3ac9a5 100644
--- a/phpBB/includes/acm/acm_eaccelerator.php
+++ b/phpBB/includes/acm/acm_eaccelerator.php
@@ -37,7 +37,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
@@ -54,7 +54,7 @@ class acm extends acm_memory
 	/**
 	 * Perform cache garbage collection
 	 *
-	 * @return void
+	 * @return null
 	 */
 	function tidy()
 	{
diff --git a/phpBB/includes/acm/acm_memcache.php b/phpBB/includes/acm/acm_memcache.php
index e54fa36c38..70bc219952 100644
--- a/phpBB/includes/acm/acm_memcache.php
+++ b/phpBB/includes/acm/acm_memcache.php
@@ -71,7 +71,7 @@ class acm extends acm_memory
 	/**
 	* Unload the cache resources
 	*
-	* @return void
+	* @return null
 	*/
 	function unload()
 	{
@@ -83,7 +83,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/acm/acm_redis.php b/phpBB/includes/acm/acm_redis.php
index 41533eaacb..dc11ca7768 100644
--- a/phpBB/includes/acm/acm_redis.php
+++ b/phpBB/includes/acm/acm_redis.php
@@ -80,7 +80,7 @@ class acm extends acm_memory
 	/**
 	* Unload the cache resources
 	*
-	* @return void
+	* @return null
 	*/
 	function unload()
 	{
@@ -92,7 +92,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/acm/acm_wincache.php b/phpBB/includes/acm/acm_wincache.php
index 0501ab74c5..7faba4f5b6 100644
--- a/phpBB/includes/acm/acm_wincache.php
+++ b/phpBB/includes/acm/acm_wincache.php
@@ -32,7 +32,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{
diff --git a/phpBB/includes/acm/acm_xcache.php b/phpBB/includes/acm/acm_xcache.php
index d0a614660c..e3d83f8bfa 100644
--- a/phpBB/includes/acm/acm_xcache.php
+++ b/phpBB/includes/acm/acm_xcache.php
@@ -48,7 +48,7 @@ class acm extends acm_memory
 	/**
 	* Purge cache data
 	*
-	* @return void
+	* @return null
 	*/
 	function purge()
 	{