#2229 changelog

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ## Breaking changes
 
+-   When creating a `pybamm.Interpolant` the default interpolator is now "linear". Passing data directly to `ParameterValues` using the ``[data]`` tag will be still used to create a cubic spline interpolant, as before ([#2258](https://github.com/pybamm-team/PyBaMM/pull/2258))
 -   Events must now be defined in such a way that they are positive at the initial conditions (events will be triggered when they become negative, instead of when they change sign in either direction) ([#2212](https://github.com/pybamm-team/PyBaMM/pull/2212))
 
 # [v22.8](https://github.com/pybamm-team/PyBaMM/tree/v22.8) - 2022-08-31

docs/tutorials/add-parameter-values.rst

@@ -102,6 +102,9 @@ called (must be in the same folder), with the tag ``[data]``, for example:
 | Example [m2.s-1]    | [data]diffusivity_AuthorYear     | AuthorYear   | some data   |
 +---------------------+----------------------------------+--------------+-------------+
 
+Data passed using the ``[data]`` tag will be used to create a cubic spline interpolant. For more control over the interpolation you can create your own :class:`Interpolant` from the data and pass that to the :class:`ParameterValues` class instead. 
+
+
 Using new parameters
 --------------------