diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17bd234ca0..1adac4b01b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@
 
 ## Breaking changes
 
+- Added `double SEI layer`, a (boolean) option in `BatteryModelOptions` to set single/double layer for SEI
 - Integrated the `[pandas]` extra into the core PyBaMM package, deprecating the `pybamm[pandas]` optional dependency. Pandas is now a required dependency and will be installed upon installing PyBaMM ([#3892](https://github.com/pybamm-team/PyBaMM/pull/3892))
 - Renamed "have_optional_dependency" to "import_optional_dependency" ([#3866](https://github.com/pybamm-team/PyBaMM/pull/3866))
 - Integrated the `[latexify]` extra into the core PyBaMM package, deprecating the `pybamm[latexify]` set of optional dependencies. SymPy is now a required dependency and will be installed upon installing PyBaMM ([#3848](https://github.com/pybamm-team/PyBaMM/pull/3848))