diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 56b2b050f49fff472f80d1a16791b77619da091b..ec5a19282ea1bafd3e7d153480c4f9e22de45b99 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,6 +1,7 @@
 Changes in Release 2.2.x
 --------------------------------------------------------------------------------
 
+ * Add AAindex databases (Kawashima et al., 2000)
  * Removed GUI components in containers
  * DSSP 4.0 support in DSSP binding (https://github.com/PDB-REDO/dssp)
  * mol.alg.PDBize does not turn plain polymer chains (not marked peptide or