Search vim help for subject under cursor

Question

While working with some Vim scripts, I found myself typing

:help {subject} 

quite a bit. I want CTRL+] (jump to definition of keyword under cursor) functionality, but instead of running :tag {ident} I want it to do :help {subject}, where {subject} is the word under the cursor.

Answer 1

Just press K. If you have set a global 'keywordprg', you need to unset it (or set it to the special :help value) in ~/.vim/after/ftplugin/vim.vim:

:setlocal keywordprg=:help 

Answer 2

The simplest solution is

nnoremap K :help <C-r><C-w><CR>