diff --git a/lib/ansible/modules/extras/system/alternatives.py b/lib/ansible/modules/extras/system/alternatives.py
index c2a4065e75..09c8d8ad3e 100644
--- a/lib/ansible/modules/extras/system/alternatives.py
+++ b/lib/ansible/modules/extras/system/alternatives.py
@@ -51,6 +51,8 @@ options:
     description:
       - The priority of the alternative
     required: false
+    default: 50
+    version_added: "2.2"
 requirements: [ update-alternatives ]
 '''