diff --git a/docs/99-Library/link-collection.md b/docs/99-Library/link-collection.md
index d9dbcd13cd622f239199147b0f6502e786d9a349..559973becacd524457ef527a8b2d4af49e94e578 100644
--- a/docs/99-Library/link-collection.md
+++ b/docs/99-Library/link-collection.md
@@ -12,6 +12,7 @@
 
 # Agile development
 
+* [Scrum Opas](https://www.scrumguides.org/scrum-guide.html)
 * [Agile Essence](https://www.ivarjacobson.com/services/agile-essentials-starter-pack-agile-practices)
 * [blog.crisp.se](https://blog.crisp.se/)