diff --git a/README.md b/README.md
index df6ee21..347c71b 100644
--- a/README.md
+++ b/README.md
@@ -35,26 +35,25 @@ Conversion from original colors to 256 colors has done according to
 ## Usage
 
 1. Check your terminal.
-    - If your terminal emulator supports 24-bit color, add the following lines
-      to your `.vimrc`.
+    - If your terminal emulator [supports true colors](https://gist.github.com/XVilka/8346728),
+      add the following lines to your `.vimrc`.
 
       ``` vim
       " Use 24-bit (true-color) mode in Vim/Neovim when outside tmux or screen.
       " If you're using tmux version 2.2 or later, you can remove the outermost $TMUX
       " check and use tmux's 24-bit color support
-      " (<http://sunaku.github.io/tmux-24bit-color.html#usage> for more information.)
+      " (http://sunaku.github.io/tmux-24bit-color.html#usage for more information.)
       if empty($TMUX) && empty($STY)
-        if has('nvim')
-          " For Neovim 0.1.3 and 0.1.4 <https://github.com/neovim/neovim/pull/2198>
-          let $NVIM_TUI_ENABLE_TRUE_COLOR = 1
-        endif
-        " For Neovim > 0.1.5 and Vim > patch 7.4.1799
-        " <https://github.com/vim/vim/commit/61be73bb0f965a895bfb064ea3e55476ac175162>
-        " Based on Vim patch 7.4.1770 (`guicolors` option)
-        " <https://github.com/vim/vim/commit/8a633e3427b47286869aa4b96f2bfc1fe65b25cd>
-        " <https://github.com/neovim/neovim/wiki/Following-HEAD#20160511>
-        if has('termguicolors')
-          set termguicolors
+        " See https://gist.github.com/XVilka/8346728.
+        if $COLORTERM =~# 'truecolor' || $COLORTERM =~# '24bit'
+          if has('termguicolors')
+            " See :help xterm-true-color
+            if $TERM =~# '^screen'
+              let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
+              let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
+            endif
+            set termguicolors
+          endif
         endif
       endif
       ```