From 9384dd971abe8754dc47498a10ee2554d8d762dd Mon Sep 17 00:00:00 2001
From: yang-g <yangg@google.com>
Date: Wed, 17 Feb 2016 14:25:23 -0800
Subject: [PATCH] add comments

---
 src/cpp/common/channel_arguments.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cpp/common/channel_arguments.cc b/src/cpp/common/channel_arguments.cc
index 72e7b2b4cf5..3e581b4a9c9 100644
--- a/src/cpp/common/channel_arguments.cc
+++ b/src/cpp/common/channel_arguments.cc
@@ -91,6 +91,9 @@ void ChannelArguments::SetCompressionAlgorithm(
 }
 
 // Note: a second call to this will add in front the result of the first call.
+// An example is calling this on a copy of ChannelArguments which already has a
+// prefix. The user can build up a prefix string by calling this multiple times,
+// each with more significant identifier.
 void ChannelArguments::SetUserAgentPrefix(
     const grpc::string& user_agent_prefix) {
   if (user_agent_prefix.empty()) {