diff --git a/test/Makefile b/test/Makefile
index c2710f1..f37b9ea 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -15,6 +15,8 @@ CFLAGS += -Wbad-function-cast -Wcast-qual -Wold-style-definition -Wshadow -Wstri
 CFLAGS += $(DEBUG)
 DEFINES =  -D UNITY_OUTPUT_CHAR=putcharSpy
 DEFINES += -D UNITY_OUTPUT_CHAR_HEADER_DECLARATION=putcharSpy\(int\)
+#DEFINES += -D UNITY_OUTPUT_FLUSH=flushSpy
+#DEFINES += -D UNITY_OUTPUT_FLUSH_HEADER_DECLARATION=flushSpy\(void\)
 DEFINES += $(UNITY_SUPPORT_64) $(UNITY_INCLUDE_DOUBLE)
 UNITY_SUPPORT_64 = -D UNITY_SUPPORT_64
 UNITY_INCLUDE_DOUBLE = -D UNITY_INCLUDE_DOUBLE