diff --git a/CHANGES/v2.2.txt b/CHANGES/v2.2.txt
index 8133601a2377a433d174762313cd8322591a8cb9..64d11bdcbc3076eccf33b4d6e6853734f5ba6299 100644
--- a/CHANGES/v2.2.txt
+++ b/CHANGES/v2.2.txt
@@ -116,6 +116,7 @@ For users:
   asks for too many atoms, see \issue{185}.
 - Optimisations (activation of the dependencies, secondary structures, DRMSD)
 - Fixed a performance regression with RMSD=OPTIMAL-FAST
+- Fixed a bug in the normalization of kernel functions (relevant for \ref HISTOGRAM).
 
 For developers:
 - Fixed a bug in the interpretation of cmd strings. Namely, an erroneous string was not triggering an error.