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 ## Bridge
 
-Decouple an abstraction from its implementation so that the two can
-vary independently. 
+Decouple an abstraction from its implementation so that the two can vary independently. 
+Bridge pattern has structural purpose and applies to objects, so it deals with the composition of objects. 
 
 ### When to use
 
diff --git a/composite/README.md b/composite/README.md
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+## Composite
+
+Compose objects into tree structures to represent part-whole hierarchies. 
+Composite lets clients treat individual objects and compositions of objects uniformly. 
+The pattern has structural purpose and applies to objects.
+
+### When to use
+
+* you want to represent part-whole hierarchies of objects
+* you want clients to be able to ignore the difference between compositions of objects and individual objects
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+## Decorator
+
+Attach additional responsibilities to an object dynamically. Decorators
+provide a flexible alternative to subclassing for extending functionality.
+The pattern has structural purpose and applies to objects.
+
+### When to use
+
+* to add responsibilities to individual objects dynamically and transparently, that is, without affecting other objects
+* for responsibilities that can be withdrawn
+* when extension by subclassing is impractical
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