diff --git a/CHANGELOG.md b/CHANGELOG.md
index befe405f6fd..66420a0fd83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,15 @@
 ## 5.17.0 (Unreleased)
+
+NOTES:
+
+* data-source/aws_s3_object: Migration to [AWS SDK for Go v2](https://aws.github.io/aws-sdk-go-v2/) means that the edge case of specifying a single `/` as the value for `key` is no longer supported ([#33358](https://github.com/hashicorp/terraform-provider-aws/issues/33358))
+
+ENHANCEMENTS:
+
+* data-source/aws_s3_object: Add `checksum_mode` argument and `checksum_crc32`, `checksum_crc32c`, `checksum_sha1` and `checksum_sha256` attributes ([#33358](https://github.com/hashicorp/terraform-provider-aws/issues/33358))
+* resource/aws_s3_object: Add `checksum_algorithm` argument and `checksum_crc32`, `checksum_crc32c`, `checksum_sha1` and `checksum_sha256` attributes ([#33358](https://github.com/hashicorp/terraform-provider-aws/issues/33358))
+* resource/aws_s3_object_copy: Add `checksum_algorithm` argument and `checksum_crc32`, `checksum_crc32c`, `checksum_sha1` and `checksum_sha256` attributes ([#33358](https://github.com/hashicorp/terraform-provider-aws/issues/33358))
+
 ## 5.16.2 (September 11, 2023)
 
 FEATURES: