diff --git a/CHANGELOG.md b/CHANGELOG.md
index 580d3948a8d4..b37c562c213d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 IMPROVEMENTS:
 
 * `azurerm_eventhub_namespace`: capacity can now be configured up to 20 [GH-556]
+* `azurerm_virtual_machine_scale_set`: Support for updating the customData field [GH-559]
 
 ## 0.3.3 (November 14, 2017)