diff --git a/doc/git-messenger.txt b/doc/git-messenger.txt
index 6ce1632..18f978e 100644
--- a/doc/git-messenger.txt
+++ b/doc/git-messenger.txt
@@ -70,11 +70,11 @@ Please ensure the following requirement before installing this plugin.
 If you use any package manager, please follow its instruction.
 
 With vim-plug:
->
+>vim
   Plug 'rhysd/git-messenger.vim'
 <
 With dein.vim:
->
+>vim
   call dein#add('rhysd/git-messenger.vim', {
               \   'lazy' : 1,
               \   'on_cmd' : 'GitMessenger',
@@ -82,7 +82,7 @@ With dein.vim:
               \ })
 <
 With minpac:
->
+>vim
   call minpac#add('rhysd/git-messenger.vim')
 <
 If you're using Vim's builtin packager, please follow instruction at |pack-add|.
@@ -268,7 +268,7 @@ limit.
 
 String value to format dates in popup window. Please see |strftime()| to know
 the details of the format.
->
+>vim
   " Example: '2019 May 26 03:27:43'
   let g:git_messenger_date_format = "%Y %b %d %X"
 <
@@ -284,7 +284,7 @@ Note: Word diff is enabled by typing "r" in a popup window.
 Options passed to |nvim_open_win| on opening a popup window. This is useful
 when you want to override some window options.
 The following example will add single border line to the window.
->
+>vim
   let g:git_messenger_floating_win_opts = { 'border': 'single' }
 <
 *g:git_messenger_popup_content_margins* (Default: |v:true|)
@@ -307,7 +307,7 @@ Highlights for diff are common with normal |diff| filetype syntax highlighting.
 
 If the groups don't fit, please rearrange the highlight with |:hi-link|.
 For example:
->
+>vim
   " Normal color in popup window with 'CursorLine'
   hi link gitmessengerPopupNormal CursorLine
 
@@ -325,7 +325,7 @@ For example:
 <
 For another example, if you want to define colors directly, defining the
 colors with |:hi| works fine as follows.
->
+>vim
   hi gitmessengerPopupNormal term=None guifg=#eeeeee guibg=#333333 ctermfg=255 ctermbg=234
   hi gitmessengerHeader term=None guifg=#88b8f6 ctermfg=111
   hi gitmessengerHash term=None guifg=#f0eaaa ctermfg=229
@@ -350,7 +350,7 @@ Filetype *gitmessengerpopup* is set in the popup window. Please hook |FileType|
 event to do some local setup within a popup window.
 
 For example:
->
+>vim
   function! s:setup_gitmessengerpopup() abort
       " For example, set go back/forward history to <C-o>/<C-i>
       nmap <buffer><C-o> o
@@ -365,12 +365,12 @@ HEALTH CHECK                                        *git-messenger-health-check*
 |git-messenger.vim| supports a health checker on Neovim. When you see some
 error, please run `:checkhealth` to check your environment is ready for use
 of this plugin.
->
+>vim
   :checkhealth
 <
 On Vim, please install vim-healthcheck and run `:CheckHealth`. It's a plugin to
 run `:checkhealth` on Vim.
->
+>vim
   :CheckHealth
 <
 https://github.com/rhysd/vim-healthcheck