diff --git a/script/scratch_scripts/README b/script/scratch_scripts/README
index 590071b..394a793 100644
--- a/script/scratch_scripts/README
+++ b/script/scratch_scripts/README
@@ -7,3 +7,7 @@
 The scripts in this folder are a copy of the scripts in the projectscratch
 folder. They should be kept in sync, deploy_scratch.sh is a helper script
 to copy them over.
+The integrity of the files in the projectscratch folder is checked by the
+check_scratch.sh script called by the tf-merge-watcher job. Please do not
+create any additional files or modify existing ones in the projectscratch
+directory without having these changes in the git repository.