diff --git a/reference/configuration/framework.rst b/reference/configuration/framework.rst
index 56906d61ab9..4ac4337478a 100644
--- a/reference/configuration/framework.rst
+++ b/reference/configuration/framework.rst
@@ -733,11 +733,11 @@ service into your autowired classes.
 auth_basic
 ..........
 
-**type**: ``array``
+**type**: ``string``
 
 The username and password used to create the ``Authorization`` HTTP header
 used in HTTP Basic authentication. The value of this option must follow the
-format ``['username', 'password']``.
+format ``username:password``.
 
 auth_bearer
 ...........