diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e74f569..072c3d36 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### `Added`
 
 ### `Changed`
-
+- Changed valid values for sex according to the PED file format [#550](https://github.com/nf-core/raredisease/pull/550)
 - Refactored config files [#538](https://github.com/nf-core/raredisease/pull/538)
 - Refactored mobile element annotation subworkflow files [#538](https://github.com/nf-core/raredisease/pull/538)