diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ffae6118a0..777f444b24b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,13 +7,20 @@ NOTES:
 
 FEATURES:
 
+* **New Data Source:** `aws_ec2_transit_gateway_multicast_domain` ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
+* **New Resource:** `aws_ec2_transit_gateway_multicast_domain` ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
+* **New Resource:** `aws_ec2_transit_gateway_multicast_domain_association` ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
+* **New Resource:** `aws_ec2_transit_gateway_multicast_group_member` ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
+* **New Resource:** `aws_ec2_transit_gateway_multicast_group_source` ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
 * **New Resource:** `aws_internet_gateway_attachment` ([#16386](https://github.com/hashicorp/terraform-provider-aws/issues/16386))
 * **New Resource:** `aws_opsworks_ecs_cluster_layer` ([#12495](https://github.com/hashicorp/terraform-provider-aws/issues/12495))
 * **New Resource:** `aws_vpc_endpoint_policy` ([#17039](https://github.com/hashicorp/terraform-provider-aws/issues/17039))
 
 ENHANCEMENTS:
 
+* data-source/aws_ec2_transit_gateway: Add `multicast_support` attribute ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
 * resource/aws_ec2_fleet: Add `context` argument ([#23304](https://github.com/hashicorp/terraform-provider-aws/issues/23304))
+* resource/aws_ec2_transit_gateway: Add `multicast_support` argument ([#22756](https://github.com/hashicorp/terraform-provider-aws/issues/22756))
 * resource/aws_imagebuilder_image_pipeline: Add `schedule.timezone` argument ([#23322](https://github.com/hashicorp/terraform-provider-aws/issues/23322))
 * resource/aws_imagebuilder_image_recipe: Add `systems_manager_agent.uninstall_after_build` argument ([#23293](https://github.com/hashicorp/terraform-provider-aws/issues/23293))
 * resource/aws_servicecatalog_provisioned_product: Add `outputs` attribute ([#23270](https://github.com/hashicorp/terraform-provider-aws/issues/23270))