diff --git a/SDS.md b/SDS.md
index 32a2256..d50b327 100644
--- a/SDS.md
+++ b/SDS.md
@@ -24,7 +24,7 @@
 
 4.**Sequence Diagram**
  **Send Class message**
-//LINK
+![](https://drive.google.com/open?id=0BznFG6PLZQZPRDE2MTNnZlR3M3M&authuser=0)
 
 1. The lecturer must login with valid account.
 2. Once in lecturer dashboard, press messaging system button.