[vim] How to comment in Vim's config files: ".vimrc"?

How do I add a comment in Vim's configuration files, like .vimrc?

You can add comments in Vim's configuration file by either:

" brief descriptiion of command

or:

"" commended command

Taken from here

Same as above. Use double quote to start the comment and without the closing quote.

Example:

set cul "Highlight current line

"This is a comment in vimrc. It does not have a closing quote 

Source: http://vim.wikia.com/wiki/Backing_up_and_commenting_vimrc