diff --git a/README.rst b/README.rst
index e8ff300..30ec1c3 100644
--- a/README.rst
+++ b/README.rst
@@ -49,7 +49,9 @@ Typical usage
         "expires": "2013-07-18T17:56:22.186Z"
     }
 
-3. Repeatedly POST subsequent chunks using the ``upload_id`` to identify the upload  to the url linked to ``ChunkedUploadView`` (or any subclass). Example:
+3. 
+Important: For each subsequent chunk, include the Content-Range header to specify the byte range being uploaded.
+Repeatedly POST subsequent chunks using the ``upload_id`` to identify the upload  to the url linked to ``ChunkedUploadView`` (or any subclass). Example:
 
 ::
 
@@ -145,4 +147,4 @@ Add any of these variables into your project settings to override them.
 Support
 -------
 
-If you find any bug or you want to propose a new feature, please use the `issues tracker <https://github.com/juliomalegria/django-chunked-upload/issues>`__. I'll be happy to help you! :-)
\ No newline at end of file
+If you find any bug or you want to propose a new feature, please use the `issues tracker <https://github.com/juliomalegria/django-chunked-upload/issues>`__. I'll be happy to help you! :-)