diff --git a/rel/files/vm.args b/rel/files/vm.args
index ef3307fed..8e37830dc 100644
--- a/rel/files/vm.args
+++ b/rel/files/vm.args
@@ -28,6 +28,10 @@
 ## max atom number
 ## +t
 
+## Set the distribution buffer busy limit (dist_buf_busy_limit) in kilobytes.
+## Valid range is 1-2097151. Default is 1024.
+## +zdbbl 8192
+
 ##-------------------------------------------------------------------------
 ## Env
 ##-------------------------------------------------------------------------