Update README.md

hwaxxer · hwaxxer · commit f4cfe87659f7 · 2014-09-02T18:38:45.000+02:00
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 BookMigration
 =============
 
-Simple app that demonstrates Core Data migration. 
+Simple app that demonstrates Core Data migration as code example accompanying the objc.io article [Custom Core Data Migrations](http://www.objc.io/issue-4/core-data-migration.html).
 
 
 ##Credits
