README.md in closure_tree-3.10.2 vs README.md in closure_tree-4.0.0

- old
+ new
@@ -442,9 +442,19 @@
 Parallelism is not tested with Rails 3.0.x nor 3.1.x due to this
 [known issue](https://github.com/rails/rails/issues/7538).
 
 ## Change log
 
+### 4.0.0
+
+* Moved all of closure_tree's implementation-detail methods into a ```ClosureTree::Support```
+  instance, which removes almost all of the namespace pollution in your models that wasn't
+  for normal consumption. If you were using any of these methods, they're now available through
+  the "_ct" class and instance member.
+
+  *This change may break consumers*, so I incremented the major version number, even though no new
+  functionality was released.
+
 ### 3.10.2
 
 * Prevent faulty SQL statement when ```#siblings``` is called on an unsaved records.
   Resolves [issue 52](https://github.com/mceachen/closure_tree/pull/52). Perfect pull
   request by [Gary Greyling](https://github.com/garygreyling).