README.md to a doc?

I don't understand how to integrate a README.md file into vim.

Example: I have installed phpcomplete.vim under bundles/
so ... I have ~/.vim/bundle/phpcomplete.vim/README.md
And it contains documentation, but if I were to copy it to
to ~/.cim/doc/phpcomplete.txt and run helptags, I get an error
message.
"""
E670: Mix of help file encodings within a language:
/Users/tim/.vim/doc/phpcomplete.txt
"""
:( and no :help README.md

using 7.3 on Mac OSX 10.7

thanks
--
Tim
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com, http://www.tj49.com

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