diff --git a/Makefile b/Makefile
index d29a3c4d5..77514bc9c 100644
--- a/Makefile
+++ b/Makefile
@@ -120,9 +120,12 @@ help:
 	@echo "		usr_install       : usr target: install"
 	@echo "		usr_uninstall     : usr target: uninstall"
 	@echo ""
-	@echo "		2perf        : changes debug state to full performance"
-	@echo "		2release     : changes debug state to release"
-	@echo "		2debug       : changes debug state to full debug"
+	@echo "		enable_proc       : switch to procfs interface"
+	@echo "		disable_proc      : switch to sysfs interface (default)"
+	@echo ""
+	@echo "		2perf             : changes debug state to full performance"
+	@echo "		2release          : changes debug state to release"
+	@echo "		2debug            : changes debug state to full debug"
 	@echo ""
 	@echo "	Note:"
 	@echo "		- install and uninstall may need root privileges"