diff --git a/patterns/2-structured/circle-communities.md b/patterns/2-structured/circle-communities.md
index 704ea54b8..55c45ec8b 100644
--- a/patterns/2-structured/circle-communities.md
+++ b/patterns/2-structured/circle-communities.md
@@ -80,3 +80,8 @@ Embracing this pattern helps InnerSource programs become vibrant, effective and
 * [Allison Kaufmann](https://www.linkedin.com/in/allisonkaufmann29)
 * [Dojo Consortium](https://dojoconsortium.org)
 * [Thingy Farm](https://thingyfarm.com/)
+
+# Alias
+
+* [Community of Practice](https://en.wikipedia.org/wiki/Community_of_practice)
+* [Guilds](https://engineering.atspotify.com/2014/03/spotify-engineering-culture-part-1/)