Then convince them they can't live without it. Then show them the marvels you've accomplished and what remains to be done. Then illustrate, in terms that are meaningful to them, the benefits they will receive by doing so. If you know why you are writing, but don't pay detailed attention to the needs of your audience, you lose. But, if you have analyzed your audience and don't really know what you are writing to them for, you still lose.
Writing takes effort.
Good writing takes effort, too. Superior writing takes effort and language expertise. In addition, it takes a strict attention to all the activities involved in reading. These qualities will ensure a piece of communication that is clear in its contents and its purpose. Have someone else proof your work, as we often miss our own errors.