diff --git a/README.md b/README.md
index 9e94668..8c099d5 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,8 @@ Easy to use Angular2 directives for files upload ([demo](http://valor-software.g
   2. `authToken` - Auth token that will be applied as 'Authorization' header during file send.
   3. `disableMultipart` - If 'true', disable using a multipart form for file upload and instead stream the file. Some APIs (e.g. Amazon S3) may expect the file to be streamed rather than sent via a form. Defaults to false.
   4. `itemAlias` - item alias (form name redefenition)
+  5. `formatDataFunction` - Function to modify the request body. 'DisableMultipart' must be 'true' for this function to be called.
+  6. `formatDataFunctionIsAsync` - Informs if the function sent in 'formatDataFunction' is asynchronous. Defaults to false.
 
 ### Events