diff --git a/packages/backend-common/config.d.ts b/packages/backend-common/config.d.ts
index 865fbb86db..53e0e0b838 100644
--- a/packages/backend-common/config.d.ts
+++ b/packages/backend-common/config.d.ts
@@ -25,6 +25,7 @@ export interface Config {
       /**
        * Secret shared by all backends for generating tokens
        * Format is base64 24-bit key
+       * @visibility secret
        */
       secret?: string;
     };