diff --git a/source/dnode/vnode/src/meta/metaCommit.c b/source/dnode/vnode/src/meta/metaCommit.c
index de3abc2c8e..ac8d99ccf0 100644
--- a/source/dnode/vnode/src/meta/metaCommit.c
+++ b/source/dnode/vnode/src/meta/metaCommit.c
@@ -24,6 +24,7 @@ int metaBegin(SMeta *pMeta, int8_t heap) {
   void (*xFree)(void *, void *) = NULL;
   void *xArg = NULL;
 
+  // default heap to META_BEGIN_HEAP_NIL
   if (heap == META_BEGIN_HEAP_OS) {
     xMalloc = tdbDefaultMalloc;
     xFree = tdbDefaultFree;