diff --git a/README.md b/README.md
index 8b7a1de..84a89eb 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,7 @@ There are a couple of default settings that can be specified in the `T4TS.tt.set
 * **DefaultOptional:** The default value for the `Optional` flag for `TypeScriptMemberAttribute`. Default is `false`.
 * **DefaultCamelCaseMemberNames:** The default value for the `CamelCase` flag for `TypeScriptMemberAttribute`. Default is `false`.
 * **DefaultInterfaceNamePrefix:** The default value for the `NamePrefix` flag for `TypeScriptInterfaceAttribute`. Default is `""`.
+* **CompatibilityVersion:** The version of Typescript that is targeted. This will help handling breaking changes in the language grammar and/or compiler. Default (right now) is _0.9.1.1_.
 
 Known problems
 ----
@@ -115,4 +116,4 @@ License
 ----
 [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
 
-Thanks to [T4MVC](http://t4mvc.codeplex.com/), which has been the inspiration. I also learned how to use the .tt-stuff from reading the source, and using part of the source code from T4MVC.
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+Thanks to [T4MVC](http://t4mvc.codeplex.com/), which has been the inspiration. I also learned how to use the .tt-stuff from reading the source, and using part of the source code from T4MVC.