update changelog

CHANGELOG.md

@@ -4,15 +4,16 @@
 
 - Added sensitivity calculation support for `pybamm.Simulation` and `pybamm.Experiment` ([#4415](https://github.com/pybamm-team/PyBaMM/pull/4415))
 - Added OpenMP parallelization to IDAKLU solver for lists of input parameters ([#4449](https://github.com/pybamm-team/PyBaMM/pull/4449))
+- Added phase-dependent particle options to LAM #4369
 - Added a lithium ion equivalent circuit model with split open circuit voltages for each electrode (`SplitOCVR`). ([#4330](https://github.com/pybamm-team/PyBaMM/pull/4330))
 
 ## Optimizations
 
 - Removed the `start_step_offset` setting and disabled minimum `dt` warnings for drive cycles with the (`IDAKLUSolver`). ([#4416](https://github.com/pybamm-team/PyBaMM/pull/4416))
 
-## Features
+## Bug Fixes
 
-- Added phase-dependent particle options to LAM #4369
+- Fixed bug where IDAKLU solver failed when `output variables` were specified and an extrapolation event is present. ([#4440](https://github.com/pybamm-team/PyBaMM/pull/4440))
 
 ## Breaking changes