diff --git a/CHANGELOG.md b/CHANGELOG.md
index e19d11cd0975..8d0cbaf0089b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ IMPROVEMENTS:
 
 BUG FIXES:
 
+* `azurerm_application_insights` - `retention_in_days` defaults to 90 [GH-6851]
 * Data Source: `azurerm_automation_account` - using the ID of the Automation Account, rather than the ID of the Automation Account's Registration Info [GH-6848]
 
 ## 2.9.0 (May 07, 2020)