--- a/runtime/scripts.vim
+++ b/runtime/scripts.vim
@@ -184,10 +184,12 @@ else
     " - "*** " in first line and "--- " in second line (context diff).
     " - "# It was generated by makepatch " in the second line (makepatch diff).
     " - "Index: <filename>" in the first line (CVS file)
+    " - "=== ", line of "=", "---", "+++ " (SVK diff)
   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\+\)'
 	\ || (s:line1 =~ '^--- ' && s:line2 =~ '^+++ ')
 	\ || (s:line1 =~ '^\* looking for ' && s:line2 =~ '^\* comparing to ')
 	\ || (s:line1 =~ '^\*\*\* ' && s:line2 =~ '^--- ')
+	\ || (s:line1 =~ '^=== ' && s:line2 =~ '^=\{66\}' && s:line3 =~ '^--- ' && s:line4 =~ '^+++')
     set ft=diff
 
     " PostScript Files (must have %!PS as the first line, like a2ps output)