diff --git a/util/ectool/Makefile b/util/ectool/Makefile
index 75504c73b6d8..1ef74d25f271 100644
--- a/util/ectool/Makefile
+++ b/util/ectool/Makefile
@@ -1,7 +1,8 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
 CC = gcc
-CFLAGS = -O2 -Wall -Wextra
+WERROR=-Werror
+CFLAGS = -O2 -Wall -Wextra -Wshadow $(WERROR)
 PROGRAM = ectool
 INSTALL = /usr/bin/env install
 PREFIX  = /usr/local
@@ -31,4 +32,10 @@ distclean: clean
 %.o: %.c
 	$(CC) $(CFLAGS) -c $^ -I. -o $@
 
-.PHONY: all install clean distclean
+help:
+	@echo "${PROGRAM}: Dump RAM of Embedded Controller (EC)"
+	@echo "Targets: all, clean, distclean, help, install"
+	@echo "To disable warnings as errors, run make as:"
+	@echo "  make all WERROR=\"\""
+
+.PHONY: all clean distclean help install