diff --git a/benchmark/benchmark.go b/benchmark/benchmark.go
index 83d5f5bd8..f7b806333 100644
--- a/benchmark/benchmark.go
+++ b/benchmark/benchmark.go
@@ -129,10 +129,10 @@ func DoStreamingRoundTrip(tc testpb.TestServiceClient, stream testpb.TestService
 		Payload:      pl,
 	}
 	if err := stream.Send(req); err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_)=_, %v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _, %v: ", tc, err)
 	}
 	if _, err := stream.Recv(); err != nil {
-		grpclog.Fatal("%v.StreamingCall(_)=_, %v: ", tc, err)
+		grpclog.Fatal("%v.StreamingCall(_) = _, %v: ", tc, err)
 	}
 }
 
diff --git a/benchmark/benchmark_test.go b/benchmark/benchmark_test.go
index 76e996886..f5bc32f42 100644
--- a/benchmark/benchmark_test.go
+++ b/benchmark/benchmark_test.go
@@ -64,7 +64,7 @@ func runStream(b *testing.B, maxConcurrentCalls int) {
 	tc := testpb.NewTestServiceClient(conn)
 	stream, err := tc.StreamingCall(context.Background())
 	if err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_)=_,%v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _,%v: ", tc, err)
 	}
 	// Warm up connection.
 	for i := 0; i < 10; i++ {
diff --git a/benchmark/client/main.go b/benchmark/client/main.go
index fdb322332..55ffea19c 100644
--- a/benchmark/client/main.go
+++ b/benchmark/client/main.go
@@ -21,7 +21,10 @@ var (
 	server            = flag.String("server", "", "The server address")
 	maxConcurrentRPCs = flag.Int("max_concurrent_rpcs", 1, "The max number of concurrent RPCs")
 	duration          = flag.Int("duration", math.MaxInt32, "The duration in seconds to run the benchmark client")
-	rpcType           = flag.Int("rpc_type", 0, "client rpc type")
+	rpcType           = flag.Int("rpc_type", 0,
+		`Configure different client rpc type. Valid options are:
+		   0 : unary call;
+		   1 : streaming call.`)
 )
 
 func unaryCaller(client testpb.TestServiceClient) {
@@ -91,7 +94,7 @@ func closeLoopStream() {
 	s, conn, tc := buildConnection()
 	stream, err := tc.StreamingCall(context.Background())
 	if err != nil {
-		grpclog.Fatalf("%v.StreamingCall(_)=_,%v: ", tc, err)
+		grpclog.Fatalf("%v.StreamingCall(_) = _,%v: ", tc, err)
 	}
 	for i := 0; i < 100; i++ {
 		streamCaller(tc, stream)