diff --git a/src/communication.jl b/src/communication.jl
index 5a9b5cf..e780f46 100644
--- a/src/communication.jl
+++ b/src/communication.jl
@@ -117,7 +117,7 @@ end
   julia> using Revise
   julia> using GeneralUtils, Dates, JSON3, UUIDs
   julia> mqttMsgReceiveTopic = ["/receivetopic_1", "/receivetopic_2"]
-  julia> mqttMsgReceiveChannel = (ch1=Channel(8), ch2=Channel(32))
+  julia> mqttMsgReceiveChannel = (ch1=Channel(8), ch2=Channel(32))  # single channel Ex. (ch1=Channel(8),)
   julia> keepaliveChannel = Channel(8)
   julia> function onMsgCallback(topic, payload)
             jobj = JSON3.read(String(payload))