diff --git a/docs/content/s3.md b/docs/content/s3.md
index 2cd0adc93..0452bfa88 100644
--- a/docs/content/s3.md
+++ b/docs/content/s3.md
@@ -380,7 +380,11 @@ However for objects which were uploaded as multipart uploads or with
 server side encryption (SSE-AWS or SSE-C) the `ETag` header is no
 longer the MD5 sum of the data, so rclone adds an additional piece of
 metadata `X-Amz-Meta-Md5chksum` which is a base64 encoded MD5 hash (in
-the same format as is required for `Content-MD5`).
+the same format as is required for `Content-MD5`).  You can use base64 -d and hexdump to check this value manually:
+
+    echo 'VWTGdNx3LyXQDfA0e2Edxw==' | base64 -d | hexdump
+
+or you can use `rclone check` to verify the hashes are OK.
 
 For large objects, calculating this hash can take some time so the
 addition of this hash can be disabled with `--s3-disable-checksum`.