diff --git a/Documentation/CHANGELOG.md b/Documentation/CHANGELOG.md
index e1c009e65..65cc2fcbc 100644
--- a/Documentation/CHANGELOG.md
+++ b/Documentation/CHANGELOG.md
@@ -15,6 +15,7 @@ Release Date: TBD
 ### Major Changes
 
 - Adds `HARK.core.AgentPopulation` class to represent a population of agents with ex-ante heterogeneous parametrizations as distributions. [#1237](https://github.com/econ-ark/HARK/pull/1237)
+- Adds `HARK.core.Parameters` class to represent a collection of time varying and time invariant parameters in a model. [#1240](https://github.com/econ-ark/HARK/pull/1240)
 
 ### Minor Changes
 
@@ -23,6 +24,7 @@ Release Date: TBD
 - Fixes bug in the metric that compares dictionaries with the same keys. [#1260](https://github.com/econ-ark/HARK/pull/1260)
 - Fixes bug in the calc_jacobian method. [#1342](https://github.com/econ-ark/HARK/pull/1342)
 - Fixes bug that prevented risky-asset consumer types from working with time-varying interest rates `Rfree`. [1343](https://github.com/econ-ark/HARK/pull/1343)
+
 ### 0.13.0
 
 Release Date: February, 16, 2023