documenting my own plugins?

Hi,

apologies if this is a silly question.

I am trying to write documentation for my plugins in the ~/.vim/ftplugin/foo/ directory.

This is what I have tried:

1) created  ~/.vim/ftplugin/foo/doc/

2) created file ~/.vim/ftplugin/foo/doc/testfoo.txt with content

*testfoo* this is a test

3) :helptags ~/.vim/ftplugin/foo/

4) But when I try 

:help testfoo 

it doesn't work.

What am I missing?

Thanks a lot in advance. Any tip is more than welcome.

Cheers,

Jose

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