diff --git a/doc/whatsnew.rst b/doc/whatsnew.rst
index dac590ccd..69a4b8648 100644
--- a/doc/whatsnew.rst
+++ b/doc/whatsnew.rst
@@ -17,6 +17,7 @@ Next release
   - Replace solar and wind technologies with new ones (:pull:`206`).
   - Reorganize input files and incorporate `first_year.csv` data into `tech_map.csv` (:pull:`221`).
   - Reconfigure use and implementation of technology variants/modules to be more agnostic (:pull:`221`).
+  - Change cost decay to reach reduction percentage specified on the year 2100 (:pull:`227`).
 - Improve and extend :doc:`/material/index` (:pull:`218`).
 
   - Release of MESSAGEix-Materials 1.1.0 (:doc:`/material/v1.1.0`).