diff --git a/CHANGELOG.md b/CHANGELOG.md
index b41bd87..1fc119c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 - Template variables support in annotations and triggers panel (trigger name field), [#428](https://github.com/alexanderzobnin/grafana-zabbix/issues/428)
 - Parsing of template variable query with braces, [#432](https://github.com/alexanderzobnin/grafana-zabbix/issues/432)
+- `sumSeries()` function bug, [#286](https://github.com/alexanderzobnin/grafana-zabbix/issues/286)
 
 
 ## [3.5.1] - 2017-07-10