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 ##Memento
 **Intent:** Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later.
 
+![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/memento/etc/memento.jpg "Memento")
+
+**Applicability:** Use the Memento pattern when
+* a snapshot of an object's state must be saved so that it can be restored to that state later, and
+* a direct interface to obtaining the state would expose implementation details and break the object's encapsulation
+
 ##Observer
 **Intent:** Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.