diff --git a/ACE/ace/Malloc_T.cpp b/ACE/ace/Malloc_T.cpp
index 8daa633f5ab04..d36376f552016 100644
--- a/ACE/ace/Malloc_T.cpp
+++ b/ACE/ace/Malloc_T.cpp
@@ -264,6 +264,7 @@ ACE_Cascaded_Dynamic_Cached_Allocator<ACE_LOCK>::free (void * ptr)
 {
   ACE_MT (ACE_GUARD (ACE_LOCK, ace_mon, this->mutex_));
 
+  // Use first allocator as a free chunk manager for all allocators when chunk freed.
   if (ptr != nullptr)
     hierarchy_[0]->free(ptr);
 }