diff --git a/Headers/Foundation/NSAutoreleasePool.h b/Headers/Foundation/NSAutoreleasePool.h
index 2ba95df12..48f562f07 100644
--- a/Headers/Foundation/NSAutoreleasePool.h
+++ b/Headers/Foundation/NSAutoreleasePool.h
@@ -220,7 +220,9 @@ typedef struct autorelease_array_list
 - (id) autorelease;
 
 #if OS_API_VERSION(100400, GS_API_LATEST)
-/** Not implemented
+/** Acts like the -release method.<br/>
+ * Intended to trigger a garbage collection run if in a garbage collected
+ * environment.
  */
 - (void) drain;
 #endif