diff --git a/docs/src/changelog.md b/docs/src/changelog.md
index 7c7f4baa2..daa392de3 100644
--- a/docs/src/changelog.md
+++ b/docs/src/changelog.md
@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Initialization of `LateralSSF` variables `ssf` and `ssfmax` with vertical hydraulic
   conductivity profile `exponential_constant`. Removed parameter `khfrac` from the
   computation, as it is already part of parameter `kh_0`.
+- Mutating BMI model control functions (`update`, `update_until` and `finalize`) and
+  extended mutating BMI functions (`load_state` and `save_state`) should return `nothing`.
 
 ### Changed
 - Removed vertical concepts `HBV` and `FLEXTopo`.