diff --git a/manual/config/seahub_settings_py.md b/manual/config/seahub_settings_py.md
index 53acc781..09370205 100644
--- a/manual/config/seahub_settings_py.md
+++ b/manual/config/seahub_settings_py.md
@@ -235,6 +235,8 @@ CLOUD_MODE = True
 # Disable global address book
 ENABLE_GLOBAL_ADDRESSBOOK = False
 
+# invitation expire time
+INVITATIONS_TOKEN_AGE = 72 # hours
 ```
 
 ## External authentication