diff --git a/joplin/config.json b/joplin/config.json
index 0762fa1d8..35636b4b1 100644
--- a/joplin/config.json
+++ b/joplin/config.json
@@ -16,10 +16,15 @@
     "APP_PORT": "22300"
   },
   "options": {
-    "APP_BASE_URL": "your_domain"
+    "APP_BASE_URL": "http://your_domain:port"
   },
   "schema": {
-    "APP_BASE_URL": "str"
+    "APP_BASE_URL": "str",
+    "DB_CLIENT": "str?",
+    "POSTGRES_PASSWORD": "str?",
+    "POSTGRES_USER": "str?",
+    "POSTGRES_PORT": "int?",
+    "POSTGRES_HOST": "str?"
   },
   "arch": ["aarch64", "amd64", "armhf", "armv7"]
 }