diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18c0d13c98..fb4d614599 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 ## Features
 
--   Added additional notebooks showing how to create and compare models ([#877](https://github.com/pybamm-team/PyBaMM/pull/877))
+-   Add new symbols `VariableDot`, representing the derivative of a variable wrt time, 
+    and `StateVectorDot`, representing the derivative of a state vector wrt time 
+    ([#858](https://github.com/pybamm-team/PyBaMM/issues/858))
+-   Added additional notebooks showing how to create and compare models 
+    ([#877](https://github.com/pybamm-team/PyBaMM/pull/877))
 -   Added `Minimum`, `Maximum` and `Sign` operators ([#876](https://github.com/pybamm-team/PyBaMM/pull/876))
 -   Added a search feature to `FuzzyDict` ([#875](https://github.com/pybamm-team/PyBaMM/pull/875))
 -   Add ambient temperature as a function of time ([#872](https://github.com/pybamm-team/PyBaMM/pull/872))