Template:Extension

Use this template on Extension: pages to describe supplementary entries.

Example:

{{Extension
 |HasExtensionID=Ex-1.4.3-1
 |HasTitle=Jewish Tavern Keepers in Galicia
 |HasAuthor=Judith Kalik
 |HasRelatedPersonalities=Person:Q123456
 |HasMainPicture=Image:1.4.3-Tavern-1
 |HasMap=File:GaliciaMap1900.jpg
}}

Then write the narrative text of the extension directly after the template call.