runtime/ftplugin/tmux.vim

" Vim filetype plugin file
" Language:	Tmux config
" Maintainer:	Eric Pruitt <eric.pruitt@gmail.com>
" Last Change:  2017 Mar 04

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

setlocal commentstring=#\ %s