diff --git a/CHANGELOG.md b/CHANGELOG.md
index 080e0807..87dcc667 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 - [PR #117](https://github.com/rqlite/rqlite/pull/117): Use Raft advertise address, if exists, during join.
 
 ## 3.0.0 (May 1st 2016)
+**The Raft log format in 3.0 is not compatible with the 2.0 series**. To upgrade from an earlier version to this release you should backup your 2.0 master node, and replay the database dump into a new 3.0 cluster.
+
 - [PR #116](https://github.com/rqlite/rqlite/pull/116): Allow HTTP advertise address to be set.
 - [PR #115](https://github.com/rqlite/rqlite/pull/115): Support advertising address different than Raft bind address.
 - [PR #113](https://github.com/rqlite/rqlite/pull/113): Switch to in-memory SQLite databases by default.