From f36abc281ad667ca6cfb05d20d86bdf57d082da4 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@163.com>
Date: Thu, 4 Nov 2021 09:11:02 +0800
Subject: [PATCH] chore(types): add comment for ver type

---
 src/emqx_types.erl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/emqx_types.erl b/src/emqx_types.erl
index 0c15bd288..3e53eafd1 100644
--- a/src/emqx_types.erl
+++ b/src/emqx_types.erl
@@ -95,7 +95,9 @@
              | ?MQTT_PROTO_V4
              | ?MQTT_PROTO_V5
              | non_neg_integer()
-             | binary()).
+             %% Some non-MQTT versions of protocol may be a binary type
+             | binary()
+             ).
 
 -type(qos() :: ?QOS_0 | ?QOS_1 | ?QOS_2).
 -type(qos_name() :: qos0 | at_most_once |