diff --git a/CHANGELOG.md b/CHANGELOG.md
index c76d57d13..7c6928867 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Added `generation_config` parameter support to `CartesiaTTSService` and
+  `CartesiaHttpTTSService` for Cartesia Sonic-3 models. Includes a new
+  `GenerationConfig` dataclass with `volume` (0.5-2.0), `speed` (0.6-1.5),
+  and `emotion` (60+ options) parameters for fine-grained speech generation
+  control.
+
 ### Changed
 
 - Updated the default model to `sonic-3` for `CartesiaTTSService` and