diff --git a/runtime/indent/sdl.vim b/runtime/indent/sdl.vim
new file mode 100644
index 0000000..9dde2c3
--- /dev/null
+++ b/runtime/indent/sdl.vim
@@ -0,0 +1,89 @@
+" Vim indent file
+" Language:	SDL
+" Maintainer:	Michael Piefel <piefel@informatik.hu-berlin.de>
+" Last Change:	2001 Sep 17
+
+" Shamelessly stolen from the Vim-Script indent file
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetSDLIndent()
+setlocal indentkeys+==~end,=~state,*<Return>
+
+" Only define the function once.
+if exists("*GetSDLIndent")
+"  finish
+endif
+
+set cpo-=C
+
+function! GetSDLIndent()
+  " 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 virtuality = '^\s*\(\(virtual\|redefined\|finalized\)\s\+\)\=\s*'
+
+  " Add a single space to comments which use asterisks
+  if getline(lnum) =~ '^\s*\*'
+    let ind = ind - 1
+  endif
+  if getline(v:lnum) =~ '^\s*\*'
+    let ind = ind + 1
+  endif
+
+  " Add a 'shiftwidth' after states, different blocks, decision (and alternatives), inputs
+  if (getline(lnum) =~? '^\s*\(start\|state\|system\|package\|connection\|channel\|alternative\|macro\|operator\|newtype\|select\|substructure\|decision\|generator\|refinement\|service\|method\|exceptionhandler\|asntype\|syntype\|value\|(.*):\|\(priority\s\+\)\=input\|provided\)'
+    \ || getline(lnum) =~? virtuality . '\(process\|procedure\|block\|object\)')
+    \ && getline(lnum) !~? 'end[[:alpha:]]\+;$'
+    let ind = ind + &sw
+  endif
+
+  " Subtract a 'shiftwidth' after states
+  if getline(lnum) =~? '^\s*\(stop\|return\>\|nextstate\)'
+    let ind = ind - &sw
+  endif
+
+  " Subtract a 'shiftwidth' on on end (uncompleted line)
+  if getline(v:lnum) =~? '^\s*end\>'
+    let ind = ind - &sw
+  endif
+
+  " Put each alternatives where the corresponding decision was
+  if getline(v:lnum) =~? '^\s*\((.*)\|else\):'
+    normal k
+    let ind = indent(searchpair('^\s*decision', '', '^\s*enddecision', 'bW',
+      \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "sdlString"'))
+  endif
+
+  " Put each state where the preceding state was
+  if getline(v:lnum) =~? '^\s*state\>'
+    let ind = indent(search('^\s*start', 'bW'))
+  endif
+
+  " Systems and packages are always in column 0
+  if getline(v:lnum) =~? '^\s*\(\(end\)\=system\|\(end\)\=package\)'
+    return 0;
+  endif
+
+  " Put each end* where the corresponding begin was
+  if getline(v:lnum) =~? '^\s*end[[:alpha:]]'
+    normal k
+    let partner=matchstr(getline(v:lnum), '\(' . virtuality . 'end\)\@<=[[:alpha:]]\+')
+    let ind = indent(searchpair(virtuality . partner, '', '^\s*end' . partner, 'bW',
+      \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "sdlString"'))
+  endif
+
+  return ind
+endfunction
+
+" vim:sw=2