diff --git a/CHANGELOG b/CHANGELOG
index bb3d51513d93d674687c2582878ae6e99d3996fb..e4881c9a842c9a47a444e78784e1a7634b25db29 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1 +1,3 @@
 2023-12-26: initial release
+2024.04.07: fixed missing/bad netmask (ThX bitwiz@froum.checkmk.com)
+            improved validation if SNMP input data