diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 8af0c6b24..4a47f1c66 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -155,6 +155,8 @@ int main(int argc, char** argv)
     // TODO: support both little and big endian.
     srs_assert(srs_is_little_endian());
 
+    // for gperf gmp or gcp, 
+    // should never enable it when not enabled for performance issue.
 #ifdef SRS_AUTO_GPERF_MP
     HeapProfilerStart("gperf.srs.gmp");
 #endif