Update README.md

Author: Alice Pintus

README.md

@@ -18,7 +18,8 @@ Please note that every Reference file should include as least a Description, som
 If you need to add images to the Asciidoc please create a folder called attachments in the same directory as the Asciidoc file. Images can be saved in SVG and PNG format, max size 200KB.
 
 ##Contribute Content on Github##
-If you are not familiar with Git you can contribute content directly on Github. [Follow this guide](https://help.github.com/articles/editing-files-in-another-user-s-repository/) to learn how to edit an .adoc file and propose a file change to the Arduino team. Please follow the guidelines of the Reference template files.
+If you are not familiar with Git you can contribute content directly on Github via their online interface. [Follow this guide](https://help.github.com/articles/editing-files-in-another-user-s-repository/) to learn how to edit an .adoc file and propose a file change to the Arduino team.  
+When suggesting a change, please follow the guidelines described in the Reference template files.
 
 ##Folder Structure
 ```