diff --git a/Doc/myformat.perl b/Doc/myformat.perl
index f4b147c..1838de3 100644
--- a/Doc/myformat.perl
+++ b/Doc/myformat.perl
@@ -161,7 +161,7 @@
     # Save the reference
     $str = &gen_index_id($str, $define);
     $index{$str} .= &make_half_href("$CURRENT_FILE#$br_id");
-    "<A NAME=\"$br_id\">$anchor_invisible_mark<\/A>";
+    "<a name=\"$br_id\">$anchor_invisible_mark<\/a>";
 }
 
 sub my_module_index_helper{