diff --git a/patches/utils/patch_header.sh b/patches/utils/patch_header.sh
index dc24bf179b1e8393e58320389ae34b1347d043f4..1af182c5172cf3cf48d456004e4e3dfe8617ed01 100644
--- a/patches/utils/patch_header.sh
+++ b/patches/utils/patch_header.sh
@@ -79,6 +79,7 @@ while test $# -gt 0; do
   ;;
  --backupdir*)
   BACKUPDIR="${1#--*=}"
+  echo "Warning: BACKUPDIR is not used currently."
   shift
   ;;
  *)