diff --git a/Example01a_UnreliableMessageFlow_VirtualEvents.mp b/Example01a_UnreliableMessageFlow_VirtualEvents.mp
index 49b0b3974ba5e57dcf42a240fa9dba6f5cb846ed..a652c55521b73f9a2e1e4b49b57362a50dd58038 100644
--- a/Example01a_UnreliableMessageFlow_VirtualEvents.mp
+++ b/Example01a_UnreliableMessageFlow_VirtualEvents.mp
@@ -2,6 +2,8 @@
 See also: Example 8: Unreliable Communication model from the Monterey Phoenix 
 System and Software Architecture and Workflow Modeling Language Manual
 
+Purpose: Demonstrate scenario similar to 1a in which Receiver may not receive.
+
 We may want to specify behaviors when some messages get lost in the transition. 
 It can be done using ‘virtual’ events.