It may be a very good idea to provide your customer with a full documentation about customisations made during the project in .chm file - standard format of Microsoft Dynamics AX help. It can be distributed and maintained easier and more flexible.
By virtue of Arijit Basu (DAX Guy) blog I created this very simple help project DAXHelpCreation.chm which can be decompiled and analysed in order to create your own help project.
It includes DAX Guy posting itself as the first article, then my short notes about .html files preparation and, finally, the entire project from Microsoft Help Kit.
Create the f. manual!