diff --git a/SDS.md b/SDS.md
index 662b29d..32a2256 100644
--- a/SDS.md
+++ b/SDS.md
@@ -22,6 +22,19 @@
   |Notifications/Alerts|Medium| We wish to have an option to notify the students about upcoming submition dates and/or messages from student/lecturer.|
   |Simple UI|Medium-Low| The UI should be as simple as can be, yet contain all features. It's very important to make the Dashboard a "clean" working enviorment with no distractions|
 
+4.**Sequence Diagram**
+ **Send Class message**
+//LINK
+
+1. The lecturer must login with valid account.
+2. Once in lecturer dashboard, press messaging system button.
+3. Choose message type - private/group/class. (in this case Class)
+4. Input message.
+5. Check optional fields (Notify all/on-response).
+6. Send or cancel message.
+7. Returns to messaging system window.
+
+
 6.**Non-Functional Demands**
 * **a. Simple to use-** UI would be simple and "clean" so that usage will be as easy as possible.
 * **b. Secure-** Login via Github will suffice a secure connection to an already existing profile.