diff --git a/Amazon-S3-API.md b/Amazon-S3-API.md
index e339036..4781d56 100644
--- a/Amazon-S3-API.md
+++ b/Amazon-S3-API.md
@@ -36,6 +36,11 @@ Currently, the following APIs are supported.
 Not included:
 * Policy
 
+# Feature difference
+|  | SeaweedFS | Amazon S3 |
+| ---------------- | -- | -- |
+| Multi-Byte Range Read| Yes | No |
+
 # Authentication
 By default, the access key and secret key to access `weed s3` is not authenticated. To To enable credential based access, create a config.json file similar to the example below, and specify it via `weed s3 -config=config.json`.