diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index e4549553684dba428eeb7b783c8d15f0b62b515e..e93a48392abf881143072e0c45ba98c5a24a3a81 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -20,6 +20,8 @@ Changes In Release 1.3.0
   * Update directory layout of OST to be more conformant with the site-package
     system of Python: Instead of storing the modules in lib{64}/ost/ost, they
     are now in lib{64}/python{{VERSION}}/site-packages/ost
+  * Added molck, the molecular checker. A small command-line tool to clean PDB 
+    files, e.g. remove atoms with zero occupancy, "atoms", hydrogens etc.
 
 Changes In Release 1.2.3
 --------------------------------------------------------------------------------