diff --git a/CDE.md b/CDE.md
index 02eff3a..e4482a6 100644
--- a/CDE.md
+++ b/CDE.md
@@ -15,7 +15,9 @@
 ![](https://gitaec.org/rvba/docs/raw/branch/main/img/opencde_pipelines.png)
 * [documents-API](https://github.com/buildingSMART/documents-API)
 
-# BIM Levels
+## BIM Levels
 
-> If we refer to the Bew-Richards maturity model, (or as it is affectionately known, “the wedge”) Level 2 BIM is described as collaborative rather than integrated, which is the Level 3 description. Collaborative BIM is actually an **assembly of distinct, interlinked domain models** (rather than a single model) each produced by individual contributors. Known as **federation** this series of models gives a completed picture of the asset. PAS 1192 refers to the central place in which these models and information are brought together as the Common Data Environment (CDE). [src](> https://www.bimplus.co.uk/bluff1ers-gui3de-pa2s-1192)
+> If we refer to the Bew-Richards maturity model, (or as it is affectionately known, “the wedge”) Level 2 BIM is described as collaborative rather than integrated, which is the Level 3 description. Collaborative BIM is actually an **assembly of distinct, interlinked domain models** (rather than a single model) each produced by individual contributors. Known as **federation** this series of models gives a completed picture of the asset. PAS 1192 refers to the central place in which these models and information are brought together as the Common Data Environment (CDE).
+
+[A bluffer’s guide to PAS 1192](https://www.bimplus.co.uk/bluff1ers-gui3de-pa2s-1192)