diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index 48b35cf..0d7f06a 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -82,4 +82,7 @@
 
 LOCAL_CFLAGS += -DHAVE_REQUEST_PRIORITY -UFAST_TRACKS_AT_NON_NATIVE_SAMPLE_RATE -USOAKER
 
+# uncomment for systrace
+# LOCAL_CFLAGS += -DATRACE_TAG=ATRACE_TAG_AUDIO
+
 include $(BUILD_SHARED_LIBRARY)