UPGRADE.md in dir_model-0.5.1 vs UPGRADE.md in dir_model-0.5.2

@@ -1,9 +1,9 @@
 # Upgrading
 
 # Upgrading from 0.4.0 to 0.5.0
 
-* Ensure you have only on definition of `file:` by dir_model
+* Ensure you have only one definition of `file:` by dir_model
 
 # Upgrading from 0.2.0 to 0.3.0
 
 * Model is now a module you have to change include from `include DirModel` to `include DirModel::Model`