diff --git a/test/cpp/microbenchmarks/bm_fullstack.cc b/test/cpp/microbenchmarks/bm_fullstack.cc
index 611ee8ddb3afb2c375d321bd352a3f62f8904159..e9259e154a3a9fd3facbb6d357e6e2f048488a07 100644
--- a/test/cpp/microbenchmarks/bm_fullstack.cc
+++ b/test/cpp/microbenchmarks/bm_fullstack.cc
@@ -830,6 +830,8 @@ BENCHMARK_TEMPLATE(BM_PumpStreamServerToClient, SockPair)
 BENCHMARK_TEMPLATE(BM_PumpStreamServerToClient, InProcessCHTTP2)
     ->Range(0, 128 * 1024 * 1024);
 
+// Generate Args for StreamingPingPong benchmarks. Currently generates args for
+// only "small streams" (i.e streams with 0, 1 or 2 messages)
 static void StreamingPingPongArgs(benchmark::internal::Benchmark* b) {
   int msg_size = 0;
   int num_ping_pongs = 0;