diff --git a/t/lib-patch-mode.sh b/t/lib-patch-mode.sh
old mode 100755
new mode 100644
index afb4b6686c..06c3c91762
--- a/t/lib-patch-mode.sh
+++ b/t/lib-patch-mode.sh
@@ -1,3 +1,5 @@
+: included from t2016 and others
+
 . ./test-lib.sh
 
 set_state () {