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diff --git a/src/core/client_config/subchannel.c b/src/core/client_config/subchannel.c
index 93c703e..6cf9062 100644
--- a/src/core/client_config/subchannel.c
+++ b/src/core/client_config/subchannel.c
@@ -79,7 +79,10 @@
size_t addr_len;
/** metadata context */
grpc_mdctx *mdctx;
- /** master channel */
+ /** master channel - the grpc_channel instance that ultimately owns
+ this channel_data via its channel stack.
+ We occasionally use this to bump the refcount on the master channel
+ to keep ourselves alive through an asynchronous operation. */
grpc_channel *master;
/** have we seen a disconnection? */
int disconnected;