Add clarifying comment

1 files changed, 2 insertions, 1 deletions

diff --git a/src/core/lib/channel/channel_args.h b/src/core/lib/channel/channel_args.h
index e2a9478115..c59bd0c7e7 100644
--- a/src/core/lib/channel/channel_args.h
+++ b/src/core/lib/channel/channel_args.h
@@ -110,7 +110,8 @@ int grpc_channel_arg_get_integer(const grpc_arg* arg,
                                  const grpc_integer_options options);
 
 /** Returns the value of \a arg if \a arg is of type GRPC_ARG_STRING.
-    Otherwise, emits a warning log, and returns nullptr */
+    Otherwise, emits a warning log, and returns nullptr.
+    If arg is nullptr, returns nullptr, and does not emit a warning. */
 char* grpc_channel_arg_get_string(const grpc_arg* arg);
 
 bool grpc_channel_arg_get_bool(const grpc_arg* arg, bool default_value);