helptag escaping

I have the following in one of my documentation files for my plugin:

        autocmd BufRead */MyProjectDir/* DBSetOption variable=blah

But when I run :helptags on that directory I get:

E154: Duplicate tag "/MyProjectDir/" in file c:\vim\vimfiles\doc/dbext.txt

Any idea how to escape something so that:

1.  The example is valid, should a user cut and paste

2.  helptags is happy

Thanks,

David

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