diff --git a/CHANGES/v2.10.md b/CHANGES/v2.10.md
index 62c22561db..e4cae820e8 100644
--- a/CHANGES/v2.10.md
+++ b/CHANGES/v2.10.md
@@ -40,7 +40,6 @@ Before switching to version 2.10, users are invited to carefully read the follow
   - In \ref ANGLES you can no longer use the GROUP, GROUPA/GROUPB/GROUPC keywords.  Explicitly list all the distances you want to compute using ATOMS1,ATOMS2,ATOMS3...
   - Action NBONDS no longer exists.  The same effect can be achieved through a more transparent implementation that you can read about here: https://plumed-school.github.io/lessons/23/001/data/Steinhardt.html
   - Action CENTER_OF_MULTICOLVAR no longer exists.  You now simply use \ref CENTER with the PHASES option and a vector as input for the weights.
-  - The rational switching function when used with MM!=2*MM now returns a more correct derivative around `dist~=R0`
   - Dimensionality reduction methods and landmark selection actions have a new syntax. A good introduction that explains how to use these actions can be found in [this tutorial](https://plumed-school.github.io/lessons/21/006/data/DIMENSIONALITY.html)
 
 - Places where we strongly recommend using the new sytax: