diff --git a/CHANGELOG.md b/CHANGELOG.md
index 240bcc3e..a2961d37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # [unreleased]
 
+Breaking changes:
+
+* The `event_id` in the response for the message and state sending endpoints is now required
+  * r0.6.0 doesn't say they are required, but this has been fixed for the next version of the spec
+
 # 0.8.0
 
 Breaking changes: