diff --git a/openwrt/target/Config.in b/openwrt/target/Config.in
index d2c35761de..1fad548133 100644
--- a/openwrt/target/Config.in
+++ b/openwrt/target/Config.in
@@ -4,3 +4,4 @@ choice
 	source "target/squashfs/Config.in"
 	source "target/squashfs-lzma/Config.in"
 endchoice
+	comment "After changing root filesystem, do make clean"