diff --git a/extensions/index.md b/extensions/index.md
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--- a/extensions/index.md
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@@ -21,7 +21,8 @@ CityJSON uses [JSON Schemas](http://json-schema.org/) to document and validate t
 A CityJSON *Extension* is a JSON file that allows us to document how the core data model of CityJSON may be extended, and to validate CityJSON files containing new objects and/or attributes.
 This is conceptually akin to the *Application Domain Extensions* (ADEs) in CityGML; see Section 10.13 of the [official CityGML documentation](https://portal.opengeospatial.org/files/?artifact_id=47842).
 
-[<i class="fas fa-external-link-alt"></i> CitySON v2.0 Extentions specifications](https://www.cityjson.org/specs/#text-sequences-and-streaming-with-cityjsonfeature)
+
+[<i class="fas fa-external-link-alt"></i> CitySON v2.0 Extension specifications](https://www.cityjson.org/specs/#text-sequences-and-streaming-with-cityjsonfeature)
 
 
 ## How to create an extension?