diff --git a/tools/generate_dnsplugins_snapcraft.sh b/tools/generate_dnsplugins_snapcraft.sh
index 92654bc86..df199f808 100755
--- a/tools/generate_dnsplugins_snapcraft.sh
+++ b/tools/generate_dnsplugins_snapcraft.sh
@@ -10,6 +10,7 @@ for PLUGIN_PATH in "${CERTBOT_DIR}"/certbot-dns-*; do
   DESCRIPTION=$(grep description "${PLUGIN_PATH}/setup.py" | sed -E 's|\s+description="(.*)",|\1|g')
   mkdir -p "${PLUGIN_PATH}/snap"
   cat <<EOF > "${PLUGIN_PATH}/snap/snapcraft.yaml"
+# This file is generated by tools/generate_dnsplugins_snapcraft.sh and should not be edited manually.
 name: ${PLUGIN}
 summary: ${DESCRIPTION}
 description: ${DESCRIPTION}