Update README.md

Author: JeroenDeDauw

README.md

@@ -113,6 +113,8 @@ A full list of supported output parameters can be obtained in wiki via the `smwd
 {{#smwdoc: moderntimeline }}
 ```
 
+You can also check the [parameter documentation](https://professional.wiki/en/extension/modern-timeline#Parameters)
+
 ## PHP Configuration
 
 The default value of all parameters can be changed by placing configuration in "LocalSettings.php".