diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b3192ef715..86f3e3bd59f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 6.4.0 (unreleased)
 
+## Plugins that need updating when upgrading from 6.3 to 6.4
+
+* [Splunk](https://grafana.com/grafana/plugins/grafana-splunk-datasource)
+
 # 6.4.0-beta2 (2019-09-25)
 
 ### Features / Enhancements
diff --git a/docs/sources/installation/upgrading.md b/docs/sources/installation/upgrading.md
index 89098006e21..d7bcd8827d3 100644
--- a/docs/sources/installation/upgrading.md
+++ b/docs/sources/installation/upgrading.md
@@ -197,3 +197,10 @@ is `7.0+` and `max concurrent shard requests` properly configured. 256 was the d
 ## Upgrading to v6.4
 
 One of the database migrations included in this release will merge multiple rows used to represent an annotation range into a single row.  If you have a large number of region annotations the database migration may take a long time to complete.  See [Upgrading to v5.2](#upgrading-to-v5-2) for tips on how to manage this process.
+
+Plugins that need updating:
+
+* [Splunk](https://grafana.com/grafana/plugins/grafana-splunk-datasource)
+
+
+