diff --git a/autoload/sy/repo.vim b/autoload/sy/repo.vim
index d433971..e545b2c 100644
--- a/autoload/sy/repo.vim
+++ b/autoload/sy/repo.vim
@@ -26,7 +26,7 @@ endif
 
 " Function: #detect {{{1
 function! sy#repo#detect(path) abort
-  for type in get(g:, 'signify_vcs_list', [ 'git', 'hg', 'svn', 'darcs', 'bzr', 'fossil', 'cvs', 'rcs', 'accurev' ])
+  for type in get(g:, 'signify_vcs_list', [ 'git', 'hg', 'svn', 'darcs', 'bzr', 'fossil', 'cvs', 'rcs', 'accurev', 'perforce' ])
     let diff = sy#repo#get_diff_{type}(a:path)
     if !empty(diff)
       return [ diff, type ]
@@ -139,6 +139,14 @@ function! sy#repo#get_diff_accurev(path) abort
   endif
 endfunction
 
+" Function: #get_diff_perforce {{{1
+function! sy#repo#get_diff_perforce(path) abort
+  if executable('perforce')
+    let diff = system('env P4DIFF=diff p4 diff -dU0 -- '. sy#util#escape(a:path))
+    return v:shell_error ? '' : diff
+  endif
+endfunction
+
 " Function: #process_diff {{{1
 function! sy#repo#process_diff(path, diff) abort
   " Determine where we have to put our signs.