diff --git a/src/include/catalog/objectaccess.h b/src/include/catalog/objectaccess.h
index d754f41202..fcb8562757 100644
--- a/src/include/catalog/objectaccess.h
+++ b/src/include/catalog/objectaccess.h
@@ -17,7 +17,9 @@
  *
  * OAT_POST_CREATE should be invoked just after the object is created.
  * Typically, this is done after inserting the primary catalog records and
- * associated dependencies.
+ * associated dependencies. The command counter may or may not be incremented
+ * at the time the hook is invoked; if not, the extension can use SnapshotSelf
+ * to get the new version of the tuple.
  *
  * OAT_DROP should be invoked just before deletion of objects; typically
  * deleteOneObject(). Its arguments are packed within ObjectAccessDrop.