diff --git a/docs/content/s3.md b/docs/content/s3.md
index 93daa00a0..168d10024 100644
--- a/docs/content/s3.md
+++ b/docs/content/s3.md
@@ -299,6 +299,14 @@ Notes on above:
 For reference, [here's an Ansible script](https://gist.github.com/ebridges/ebfc9042dd7c756cd101cfa807b7ae2b) 
 that will generate one or more buckets that will work with `rclone sync`.
 
+### Key Management System (KMS) ###
+
+If you are using server side encryption with KMS then you will find
+you can't transfer small objects.  As a work-around you can use the
+`--ignore-checksum` flag.
+
+A proper fix is being worked on in [issue #1824](https://github.com/ncw/rclone/issues/1824).
+
 ### Glacier ###
 
 You can transition objects to glacier storage using a [lifecycle policy](http://docs.aws.amazon.com/AmazonS3/latest/user-guide/create-lifecycle.html).