diff --git a/tests/cache/MemcacheCacheTest.php b/tests/cache/MemcacheCacheTest.php
index ec8bd02..4ff2959 100644
--- a/tests/cache/MemcacheCacheTest.php
+++ b/tests/cache/MemcacheCacheTest.php
@@ -8,6 +8,8 @@
  * @since 2011-10-25
  * 
  * Unit tests for MemcacheCache class
+ * 
+ * Tests need test_helpers extension by Sebastian Bergmann
  */