uml/state-machine-diagram.md

-**Sources:** http://www.omg.org/spec/UML/2.5 (Starting at PDF page ...)
+**Sources:** http://www.omg.org/spec/UML/2.5 (Starting at PDF page 345)
 
 # Usage Scenarios
 The **state machine diagram** is used to illustrate the life-cycle of single objects and the behavior of operations within a software system