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diff --git a/doc/asciidoc/vim/ftdetect/asciidoc_filetype.vim b/doc/asciidoc/vim/ftdetect/asciidoc_filetype.vim
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+++ b/doc/asciidoc/vim/ftdetect/asciidoc_filetype.vim
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+" Vim filetype detection file
+" Language:     AsciiDoc
+" Author:       Stuart Rackham <srackham@gmail.com>
+" Last Change:  AsciiDoc 8.2.0
+" URL:          http://www.methods.co.nz/asciidoc/
+" Licence:      GPL (http://www.gnu.org)
+" Remarks:      Vim 6 or greater
+
+" COMMENT OUT ONE OF THE TWO FOLLOWING COMMANDS
+" The first sets asciidoc syntax highlighting on all .txt files, the second
+" only existing files *.txt that appear to be AsciiDoc files.
+
+au BufNewFile,BufRead *.asciidoc,*.txt,README,TODO,CHANGELOG,NOTES  setfiletype asciidoc
+"au BufRead *.txt,README,TODO,CHANGELOG,NOTES call s:FTasciidoc()
+
+" This function checks for a valid AsciiDoc document title after first
+" skipping any leading comments.
+function! s:FTasciidoc()
+  let in_comment_block = 0
+  let n = 1
+  while n < 50
+    let line = getline(n)
+    let n = n + 1
+    if line =~ '^/\{4,}$'
+      if ! in_comment_block
+        let in_comment_block = 1
+      else
+        let in_comment_block = 0
+      endif
+      continue
+    endif
+    if in_comment_block
+      continue
+    endif
+    if line !~ '\(^//\)\|\(^\s*$\)'
+      break
+    endif
+  endwhile
+  if line !~ '.\{3,}'
+    return
+  endif
+  let len = len(line)
+  let line = getline(n)
+  if line !~ '[-=]\{3,}'
+    return
+  endif
+  if len < len(line) - 3 || len > len(line) + 3
+    return
+  endif
+  setfiletype asciidoc
+endfunction
+
+" vim: et sw=2 ts=2 sts=2: