diff --git a/etc/emq.conf b/etc/emq.conf
index 5f43eff51..196ea99f3 100644
--- a/etc/emq.conf
+++ b/etc/emq.conf
@@ -130,14 +130,14 @@ mqtt.client.enable_stats = off
 ## Upgrade QoS?
 mqtt.session.upgrade_qos = off
 
-## Max number of QoS 1 and 2 messages that can be “inflight” at one time.
+## Max Size of the Inflight Window for QoS1 and QoS2 messages
 ## 0 means no limit
 mqtt.session.max_inflight = 32
 
 ## Retry Interval for redelivering QoS1/2 messages.
 mqtt.session.retry_interval = 20s
 
-## Max Packets that Awaiting PUBREL, 0 means no limit
+## Client -> Broker: Max Packets Awaiting PUBREL, 0 means no limit
 mqtt.session.max_awaiting_rel = 100
 
 ## Awaiting PUBREL Timeout