Quick help in vimrc

Normally, K will show you the man-page of the word under the cursor. It's a nifty feature, but man is not always the most relevant command.

You can bind it to open the :help in Vim, when you are in a VimScript file, this is very handy when you are working on your vimrc and need a quick explanation of what a setting does.

Put this in .vim/after/ftplugin/vim.vim:

nnoremap <buffer> K :help <C-r><C-w><CR>
xnoremap <buffer> K "xy:help <C-r>x<CR>

Update

2020-08-13

This should be done by setting keywordprg=:help, which is already the default in NeoVim.