--- a/runtime/scripts.vim
+++ b/runtime/scripts.vim
@@ -1,7 +1,7 @@
 " Vim support file to detect file types in scripts
 "
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last change:	2010 Sep 22
+" Last change:	2012 Aug 30
 
 " This file is called by an autocommand for every file that has just been
 " loaded into a buffer.  It checks if the type of file can be recognized by
@@ -198,7 +198,8 @@ else
     " - "=== ", line of "=", "---", "+++ " (SVK diff)
     " - "=== ", "--- ", "+++ " (bzr diff, common case)
     " - "=== (removed|added|renamed|modified)" (bzr diff, alternative)
-  elseif s:line1 =~ '^\(diff\>\|Only in \|\d\+\(,\d\+\)\=[cda]\d\+\>\|# It was generated by makepatch \|Index:\s\+\f\+\r\=$\|===== \f\+ \d\+\.\d\+ vs edited\|==== //\f\+#\d\+\)'
+    " - "# HG changeset patch" in first line (Mercurial export format)
+  elseif s:line1 =~ '^\(diff\>\|Only in \|\d\+\(,\d\+\)\=[cda]\d\+\>\|# It was generated by makepatch \|Index:\s\+\f\+\r\=$\|===== \f\+ \d\+\.\d\+ vs edited\|==== //\f\+#\d\+\|# HG changeset patch\)'
 	\ || (s:line1 =~ '^--- ' && s:line2 =~ '^+++ ')
 	\ || (s:line1 =~ '^\* looking for ' && s:line2 =~ '^\* comparing to ')
 	\ || (s:line1 =~ '^\*\*\* ' && s:line2 =~ '^--- ')