diff --git a/Filer-Server-API.md b/Filer-Server-API.md
index e287fef..ac7e4a9 100644
--- a/Filer-Server-API.md
+++ b/Filer-Server-API.md
@@ -33,8 +33,7 @@ You can append to any HTTP API with &pretty=y to see a formatted json output.
 | maxMB | max chunk size | empty |
 | mode | file mode | 0660 |
 | header: `Content-Type` | used for auto compression | empty |
-
-
+| prefixed header: `Seaweed-` | example: `Seaweed-name1: value1`. Returned as `Seaweed-Name1: value1` in GET/HEAD response header. | empty |
 
 Examples:
 ```bash