add a DO NOT EDIT comment

diff --git a/mk/validate-settings.mk b/mk/validate-settings.mk
index 14ae5b2..7d647ed 100644 (file)
--- a/mk/validate-settings.mk
+++ b/mk/validate-settings.mk
@@ -1,3 +1,5 @@
+# DO NOT EDIT!  Instead, create a file mk/validate.mk, whose settings will
+# override these.  See also mk/custom-settings.mk.
 
 WERROR          = -Werror