diff --git a/auto/make b/auto/make
index e8ca7fdd4..76adf743e 100644
--- a/auto/make
+++ b/auto/make
@@ -553,4 +553,13 @@ include $NXT_MAKEFILE
 clean:
 		rm -rf $NXT_BUILD_DIR *.dSYM Makefile
 
+.PHONY: help
+help:
+	@echo "Variables to control make/build behaviour:"
+	@echo
+	@echo "  make V=1 ...           - Enables verbose output"
+	@echo "  make D=1 ...           - Enables debug builds (-O0)"
+	@echo "  make E=0 ...           - Disables -Werror"
+	@echo
+	@echo "  Variables can be combined."
 END