diff --git a/Doc/myformat.perl b/Doc/myformat.perl
index c6cf3275884..b1ba493d808 100644
--- a/Doc/myformat.perl
+++ b/Doc/myformat.perl
@@ -1,4 +1,4 @@
-# myformat.perl by Guido van Rossum <guido@cwi.nl> 25 Jan 1994
+# myformat.perl by Guido van Rossum <guido@cwi.nl> 25 Jan 1994	-*- perl -*-
 #
 # Extension to LaTeX2HTML for documents using myformat.sty.
 # Subroutines of the form do_cmd_<name> here define translations