diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42cc313b7..89ddba762 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,7 @@
 - [#5219](https://github.com/influxdata/telegraf/issues/5219): Allow non local udp connections in net_response.
 - [#5218](https://github.com/influxdata/telegraf/issues/5218): Fix toml option names in parser processor.
 - [#5225](https://github.com/influxdata/telegraf/issues/5225): Fix panic in docker input with bad endpoint.
+- [#5209](https://github.com/influxdata/telegraf/issues/5209): Fix original metric modified by aggregator filters.
 
 ## v1.9.1 [2018-12-11]