diff --git a/Makefile b/Makefile
index eb1c7a51d3..fa868229e8 100755
--- a/Makefile
+++ b/Makefile
@@ -115,8 +115,8 @@ ifeq (${OSARCH},OpenBSD)
 CFLAGS+=-pthread
 endif
 
-# Comment this out if you have trouble with Feature B signalling (rare)
-CFLAGS+=-DOLD_DSP_ROUTINES
+#Uncomment this to use the older DSP routines
+#CFLAGS+=-DOLD_DSP_ROUTINES
 
 CFLAGS+=$(shell if [ -f /usr/include/linux/zaptel.h ]; then echo "-DZAPTEL_OPTIMIZATIONS"; fi)