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When I put a symbolic link to a .txt documentation plugin, vim doesn't show me the help

Example: I have in ~/.vim/doc

 $ ls -al NERD_tree.txt 
 NERD_tree.txt -> PATH/nerdtree/doc/NERD_tree.txt

in vim:

:h NERDtree

This command doesn't show the documentation.

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up vote 6 down vote accepted

Vim needs to know when the help files are updated, so it can know where the NERDtree tag should point. Running the following in vim should fix it:

:helptags ~/.vim/doc
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