diff --git a/changelog.md b/changelog.md
index 665ada0398..28118305d5 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+### Breaking Changes
+* Observer param `ballot_maturity_blocks` is part of `emissions` module now. Observer `params` are deprecated and removed from `observer` module.
+
 ### Features
 * [2039](https://github.com/zeta-chain/node/pull/2039) - cosmos v0.47 upgrade