diff --git a/README.md b/README.md
index fd6e26ff..2ac6a934 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,8 @@ Then visit [http://localhost:8080](http://localhost:8080) in your browser. If th
 ## WARNINGS
 ### v0.2.0 [![Queued](https://badge.waffle.io/amark/gun.svg?label=Queue&title=Queue)](http://waffle.io/amark/gun) [![In Progress](https://badge.waffle.io/amark/gun.svg?label=InProgress&title=In%20Progress)](http://waffle.io/amark/gun) [![Pending Deploy](https://badge.waffle.io/amark/gun.svg?label=Pending&title=Done)](http://waffle.io/amark/gun) Status
 
+The wire protocol was changed between 0.1.x and 0.2.x, meaning if you upgrade gun your old data might not load properly. If you are listening for errors you will get a `''Not a valid graph!'` but if you are not listening to errors it will be silent, beware of this. Here is a [migration guide](https://github.com/amark/gun/wiki/Migration-Guide) if you are having problems.
+
 Version 0.2.0 is currently in alpha.  Important changes include `.get` to `.val`, `.load` to `.get`, and `.set` to `.put`. Documentation is our current focus, and `.all` functionality will be coming soon.  The latest documentation can be found at https://github.com/amark/gun/wiki/0.2.0-API-and-How-to.  Please report any issues via https://github.com/amark/gun/issues.
 
 GUN is not stable, and therefore should not be trusted in a production environment.