diff --git a/Filer-Server-API.md b/Filer-Server-API.md
index be01632..377a311 100644
--- a/Filer-Server-API.md
+++ b/Filer-Server-API.md
@@ -35,6 +35,7 @@ You can append to any HTTP API with &pretty=y to see a formatted json output.
 | header: `Content-Type` | used for auto compression | empty |
 | header: `X-Amz-Tagging` | example: `X-Amz-Tagging: name1=value1&name2=value2`. Returned as `X-Amz-Tagging-Name1: value1` In GET/HEAD response header.| empty |
 | prefixed header: `X-Amz-Meta-` | example: `X-Amz-Meta-name1: value1`. Returned as `X-Amz-Meta-Name1: value1` in GET/HEAD response header. | empty |
+| header: `x-amz-storage-class` | example: `x-amz-storage-class: standard`. Returned as `X-Amz-Storage-Class: standard` in GET/HEAD response header. The value is not used yet. | empty |