diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index af007259420189de595538d71a69c4e3aea0bde0..c5ae5d2a49de307843bd31c986b7bab853c880dd 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,5 +1,10 @@
-Changes in Release 1.2.2
+Changes In Release 1.2.3
+--------------------------------------------------------------------------------
+
+  * PDBWriter: Prevent writing of out-of-bounds atom coordinates.
 
+Changes in Release 1.2.2
+--------------------------------------------------------------------------------
   * Fixed loop indentation in the PDBize function for bio units, leading to
     exponential running time/ memory consumption. This problem only affected a
     fraction of PDB entries.