The properties you apply to a document provide valuable information to your user as soon as they access the file. Adding information such as document title, author, keywords and setting the language are all important accessibility features. In Word 2013 these fields can be accessed by the following paths:
File > Info> Properties > Show Document Panel
Enter information to the 'Author' and 'Title' Fields
File > Options > Language
Select 'English' from the dialogue under the 'Choose Editing Languages' heading
Office 2013 has an in-built accessibility checker that can highlight potential issues with your document. The checker can be found on the following path:
File > Info > Check for Issues > Check for Accessibility
The check includes clear instructions on how to fix any issues it returns.