diff --git a/aw-design-diagram/principal-user-registration-sequence.md b/aw-design-diagram/principal-user-registration-sequence.md
index a35b23b9d263d16414979b5833c3864ce76ff490..e0debe21c49455aa85898ba5714234c5d320f9c2 100644
--- a/aw-design-diagram/principal-user-registration-sequence.md
+++ b/aw-design-diagram/principal-user-registration-sequence.md
@@ -1,3 +1,4 @@
+```mermaid
 sequenceDiagram
 participant Playstore/Appstore
 participant PCM User
@@ -33,3 +34,4 @@ participant OCM Attestation Manager
   OCM Principal Manager ->> OCM Attestation Manager: Requests Attestation Manager with Principal Credential CredDef to issue credential based on CredDef
   OCM Attestation Manager ->> PCM App: Issues Credential to the individual and the credential gets stored in PCM App's wallet
   end
+```