Update README.md

leshalv · Jun 4, 2017 · a0916aa · a0916aa
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diff --git a/extension-objects/README.md b/extension-objects/README.md
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 Anticipate that an object’s interface needs to be extended in the future. Additional
 interfaces are defined by extension objects.
 
-![alt text](./etc/extension_obj1.png "Extension objects")
+![Extension_objects](./etc/extension_obj.png "Extension objects")
 
 ## Applicability
 Use the Extension Objects pattern when: