diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59e3bdfa..03d6a64f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+| :warning:  WARNING                                                                                                                                 |
+|----------------------------------------------------------------------------------------------------------------------------------------------------|
+| This version of `blockfrost-backend-ryo` requires `cardano-db-sync 13.1.1.3` or newer. Use version `1.7.x` for earlier `cardano-db-sync` releases. |
+
+### Added
+
+- translation of cost models from numerical IDs to strings,
+  required for `cardano-db-sync 13.1.1.3` and newer (#130)
+
 ### Updated
 
 - node_modules