diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4269d69d4..44cb7ca8e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed a phantom `UNKNOWN` slice in the portfolio proportion chart component caused by floating-point rounding
 - Fixed the time zone handling in the `api` test suite for deterministic execution in `UTC`
 
 ## 3.17.0 - 2026-06-26