diff --git a/CHANGES/v2.4.md b/CHANGES/v2.4.md
index 95977e02783853aad455d5fea7d84c341022c289..07a6637957c29f0075119a67f21514d11ee87b95 100644
--- a/CHANGES/v2.4.md
+++ b/CHANGES/v2.4.md
@@ -67,6 +67,8 @@ Changes from version 2.3 which are relevant for users:
   - Internal molfile implementation has been updated to VMD 1.9.3.
   - Examples in the documentation now have syntax highlighting and links to the documentation of used actions.
   - \ref COORDINATIONNUMBER : Added option to have pairwise distance moments of coordination number in the multicolvar module
+  - Added experimental lepton support. Set env var `export PLUMED_USE_LEPTON=yes` to activate lepton as a matheval replacement.
+    Notice that this is an experimental feature and is not fully validated yet. See \issue{244}.
 
 Changes from version 2.3 which are relevant for developers:
   - A few fixes has been made to improve exception safety. Although we still cannot declare