diff --git a/Makefile b/Makefile
index 9908566..69c58f4 100644
--- a/Makefile
+++ b/Makefile
@@ -80,4 +80,10 @@ update_next_tag:
 	sed -i "s/NEXT_VERSION/$(VERSION)/g" *.ml *.mli
 	sed -i "s/NEXT_RELEASE/$(VERSION)/g" *.ml *.mli
 
-.PHONY: benchs tests examples update_next_tag push_doc push_stable
+watch:
+	while find src/ -print0 | xargs -0 inotifywait -e delete_self -e modify ; do \
+		echo "============ at `date` ==========" ; \
+		make all; \
+	done
+
+.PHONY: benchs tests examples update_next_tag push_doc push_stable watch