diff --git a/doc/src/extras.rst b/doc/src/extras.rst
index 82a2be18..bdf8fc1b 100644
--- a/doc/src/extras.rst
+++ b/doc/src/extras.rst
@@ -232,7 +232,7 @@ The individual messages in the replication stream are presented by
             >>> cur.identify_system()
             {'timeline': 1, 'systemid': '1234567890123456789', 'dbname': 'test', 'xlogpos': '0/1ABCDEF'}
 
-    .. method:: create_replication_slot(slot_name, output_plugin=None)
+    .. method:: create_replication_slot(slot_name, slot_type=None, output_plugin=None)
 
         Create streaming replication slot.