update delete folder

source/includes/_library.md

@@ -72,10 +72,21 @@ Delete objects stored in S3.
 #### Parameters
 Name | Type | Constraints | Description
 --------|-------|--------- | ------
-objectKeys | string | required| list of keys to delete
+objectKeys | string | required| list of keys to delete or foldername (read below)
 
 ```
 Payload {
     objectKeys: ['key1', 'key2']
 }
 ```
+
+<aside class="notice">
+The endpoint is capable of deleting files or a folder. To delete a folder just pass folder path ending with '/' as an array.
+It's not possible to delete multiple folders in one request.
+</aside>
+
+```
+Delete folder payload {
+    objectKeys: ['path/to/folder/']
+}
+```