diff --git a/docs/content/s3.md b/docs/content/s3.md
index 05021f78c..fe3e7db4d 100644
--- a/docs/content/s3.md
+++ b/docs/content/s3.md
@@ -1112,6 +1112,11 @@ server_side_encryption =
 storage_class =
 ```
 
+If you are using an older version of CEPH, eg 10.2.x Jewel, then you
+may need to supply the parameter `--s3-upload-cutoff 0` or put this in
+the config file as `upload_cutoff 0` to work around a bug which causes
+uploading of small files to fail.
+
 Note also that Ceph sometimes puts `/` in the passwords it gives
 users.  If you read the secret access key using the command line tools
 you will get a JSON blob with the `/` escaped as `\/`.  Make sure you