diff --git a/grampsweb/config.yaml b/grampsweb/config.yaml
index a28254bbe..f5189eb0c 100644
--- a/grampsweb/config.yaml
+++ b/grampsweb/config.yaml
@@ -77,6 +77,9 @@ ports:
   5000/tcp: 5000
 ports_description:
   5000/tcp: webui
+schema: {
+  "GRAMPSWEB_SECRET_KEY": "str?"
+}
 services:
 - mysql:want
 slug: grampsweb