diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04071adc3..76e5db5a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ BACKWARDS INCOMPATIBILITIES:
   * Release binaries are now provided via <https://releases.hashicorp.com>.
   * Packer 0.9.0 is now built with Go 1.5. Future versions will drop support
     for building with Go 1.4.
+  * Inline `user_data` for EC2 is now base64 encoded automatically.
 
 FEATURES: