diff --git a/docs/admin/15_config_files.rst b/docs/admin/15_config_files.rst
index adb94a8cac6375ec1b06dbb1de4b60fb0c761165..556713437cc467c38a4b3f2acf05c070b46554c6 100644
--- a/docs/admin/15_config_files.rst
+++ b/docs/admin/15_config_files.rst
@@ -40,7 +40,7 @@ A configuration file might look like this::
   password = "SuperSecretPassword"
 
   [caching]
-  redis = { enabled = true, address = "127.0.0.1" }
+  redis = { enabled = true, address = "redis://127.0.0.1" }
 
 The `secret_key` setting above defines a single value. The following `http`
 section defines a table (cf. a dictionary) in one way, and you can see the