diff --git a/docs/Changelog.md b/docs/Changelog.md
index 0b7c70dac2b..55b76823b79 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -20,6 +20,7 @@ based on merged pull requests. Search GitHub issues and pull requests for smalle
 - Add prettier:write to docs and rephrase slightly [ci skip] [#5831](https://github.com/opentripplanner/OpenTripPlanner/pull/5831)
 - Make naming of stopTransferCosts/stopBoardAlightCosts consistent [#5822](https://github.com/opentripplanner/OpenTripPlanner/pull/5822)
 - Namer for applying street names to nearby sidewalks [#5774](https://github.com/opentripplanner/OpenTripPlanner/pull/5774)
+- Implement GTFS Flex safe duration spec draft [#5796](https://github.com/opentripplanner/OpenTripPlanner/pull/5796)
 [](AUTOMATIC_CHANGELOG_PLACEHOLDER_DO_NOT_REMOVE)
 
 ## 2.5.0 (2024-03-13)