diff --git a/runtime/indent/sml.vim b/runtime/indent/sml.vim
new file mode 100644
index 0000000..30d3108
--- /dev/null
+++ b/runtime/indent/sml.vim
@@ -0,0 +1,215 @@
+" Vim indent file
+" Language:     SML
+" Maintainer:	Saikat Guha <sg266@cornell.edu>
+" 				Hubert Chao <hc85@cornell.edu>
+" Original OCaml Version:
+" 				Jean-Francois Yuen  <jfyuen@ifrance.com>
+"               Mike Leary          <leary@nwlink.com>
+"               Markus Mottl        <markus@oefai.at>
+" OCaml URL:    http://www.oefai.at/~markus/vim/indent/ocaml.vim
+" Last Change:  2003 Jan 04	- Adapted to SML
+" 				2002 Nov 06 - Some fixes (JY)
+"               2002 Oct 28 - Fixed bug with indentation of ']' (MM)
+"               2002 Oct 22 - Major rewrite (JY)
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal expandtab
+setlocal indentexpr=GetSMLIndent()
+setlocal indentkeys+=0=and,0=else,0=end,0=handle,0=if,0=in,0=let,0=then,0=val,0=fun,0=\|,0=*),0)
+setlocal nolisp
+setlocal nosmartindent
+setlocal textwidth=80
+setlocal shiftwidth=2
+
+" Comment formatting
+if (has("comments"))
+  set comments=sr:(*,mb:*,ex:*)
+  set fo=cqort
+endif
+
+" Only define the function once.
+"if exists("*GetSMLIndent")
+"finish
+"endif
+
+" Define some patterns:
+let s:beflet = '^\s*\(initializer\|method\|try\)\|\(\<\(begin\|do\|else\|in\|then\|try\)\|->\|;\)\s*$'
+let s:letpat = '^\s*\(let\|type\|module\|class\|open\|exception\|val\|include\|external\)\>'
+let s:letlim = '\(\<\(sig\|struct\)\|;;\)\s*$'
+let s:lim = '^\s*\(exception\|external\|include\|let\|module\|open\|type\|val\)\>'
+let s:module = '\<\%(let\|sig\|struct\)\>'
+let s:obj = '^\s*\(constraint\|inherit\|initializer\|method\|val\)\>\|\<\(object\|object\s*(.*)\)\s*$'
+let s:type = '^\s*\%(let\|type\)\>.*='
+let s:val = '^\s*\(val\|external\)\>.*:'
+
+" Skipping pattern, for comments
+function! s:SkipPattern(lnum, pat)
+  let def = prevnonblank(a:lnum - 1)
+  while def > 0 && getline(def) =~ a:pat
+    let def = prevnonblank(def - 1)
+  endwhile
+  return def
+endfunction
+
+" Indent for ';;' to match multiple 'let'
+function! s:GetInd(lnum, pat, lim)
+  let llet = search(a:pat, 'bW')
+  let old = indent(a:lnum)
+  while llet > 0
+    let old = indent(llet)
+    let nb = s:SkipPattern(llet, '^\s*(\*.*\*)\s*$')
+    if getline(nb) =~ a:lim
+      return old
+    endif
+    let llet = search(a:pat, 'bW')
+  endwhile
+  return old
+endfunction
+
+" Indent pairs
+function! s:FindPair(pstart, pmid, pend)
+  call search(a:pend, 'bW')
+"  return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
+  let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
+  if lno == -1
+	return indent(lno)
+  else
+	return col(".") - 1
+  endif
+endfunction
+
+function! s:FindLet(pstart, pmid, pend)
+  call search(a:pend, 'bW')
+"  return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
+  let lno = searchpair(a:pstart, a:pmid, a:pend, 'bW', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"')
+  let moduleLine = getline(lno)
+  if lno == -1 || moduleLine =~ '^\s*\(fun\|structure\|signature\)\>'
+	return indent(lno)
+  else
+	return col(".") - 1
+  endif
+endfunction
+
+" Indent 'let'
+"function! s:FindLet(pstart, pmid, pend)
+"  call search(a:pend, 'bW')
+"  return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment" || getline(".") =~ "^\\s*let\\>.*=.*\\<in\\s*$" || getline(prevnonblank(".") - 1) =~ "^\\s*let\\>.*=\\s*$\\|" . s:beflet'))
+"endfunction
+
+function! GetSMLIndent()
+  " Find a non-blank line above the current line.
+  let lnum = prevnonblank(v:lnum - 1)
+
+  " At the start of the file use zero indent.
+  if lnum == 0
+    return 0
+  endif
+
+  let ind = indent(lnum)
+  let lline = getline(lnum)
+
+	" Return double 'shiftwidth' after lines matching:
+	if lline =~ '^\s*|.*=>\s*$'
+		return ind + &sw + &sw
+	elseif lline =~ '^\s*val\>.*=\s*$'
+		return ind + &sw
+	endif
+
+  let line = getline(v:lnum)
+
+	" Indent lines starting with 'end' to matching module
+	if line =~ '^\s*end\>'
+		return s:FindLet(s:module, '', '\<end\>')
+
+	" Match 'else' with 'if'
+	elseif line =~ '^\s*else\>'
+	  	if lline !~ '^\s*\(if\|else\|then\)\>'
+				return s:FindPair('\<if\>', '', '\<then\>')
+	  	else return ind
+		endif
+
+	" Match 'then' with 'if'
+	elseif line =~ '^\s*then\>'
+  	if lline !~ '^\s*\(if\|else\|then\)\>'
+		  return s:FindPair('\<if\>', '', '\<then\>')
+	else return ind
+	endif
+
+	" Indent if current line begins with ']'
+	elseif line =~ '^\s*\]'
+		return s:FindPair('\[','','\]')
+
+  " Indent current line starting with 'in' to last matching 'let'
+	elseif line =~ '^\s*in\>'
+		let ind = s:FindLet('\<let\>','','\<in\>')
+
+	" Indent from last matching module if line matches:
+	elseif line =~ '^\s*\(fun\|val\|open\|structure\|and\|datatype\|type\|exception\)\>'
+		cursor(lnum,1)
+  		let lastModule = indent(searchpair(s:module, '', '\<end\>', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
+		if lastModule == -1
+			return 0
+		else
+			return lastModule + &sw
+		endif
+
+	" Indent lines starting with '|' from matching 'case', 'handle'
+	elseif line =~ '^\s*|'
+		" cursor(lnum,1)
+		let lastSwitch = search('\<\(case\|handle\|fun\|datatype\)\>','bW')
+		let switchLine = getline(lastSwitch)
+		let switchLineIndent = indent(lastSwitch)
+		if lline =~ '^\s*|'
+		  return ind
+		endif
+		if switchLine =~ '\<case\>'
+			return col(".") + 2
+		elseif switchLine =~ '\<handle\>'
+			return switchLineIndent + &sw
+		elseif switchLine =~ '\<datatype\>'
+			call search('=')
+			return col(".") - 1
+		else
+			return switchLineIndent + 2
+		endif
+
+
+  " Indent if last line ends with 'sig', 'struct', 'let', 'then', 'else',
+  " 'in'
+  elseif lline =~ '\<\(sig\|struct\|let\|in\|then\|else\)\s*$'
+		let ind = ind + &sw
+
+  " Indent if last line ends with 'of', align from 'case'
+  elseif lline =~ '\<\(of\)\s*$'
+		call search('\<case\>',"bW")
+		let ind = col(".")+4
+
+	" Indent if current line starts with 'of'
+  elseif line =~ '^\s*of\>'
+		call search('\<case\>',"bW")
+		let ind = col(".")+1
+
+
+	" Indent if last line starts with 'fun', 'case', 'fn'
+	elseif lline =~ '^\s*\(fun\|fn\|case\)\>'
+		let ind = ind + &sw
+
+	endif
+
+	" Don't indent 'let' if last line started with 'fun', 'fn'
+	if line =~ '^\s*let\>'
+		if lline =~ '^\s*\(fun\|fn\)'
+			let ind = ind - &sw
+		endif
+  endif
+
+  return ind
+
+endfunction
+
+" vim:sw=2