can't get rid of module/comment.module

This is strange and I'm not quite sure what I'm doing wrong, or if it is intentionally in the CVS this way: I have the cvs sources checked out on the -r DRUPAL-5-1, but every time I update -dP, the modules/comment.module from 4.7 comes back!

File: comment.module    Status: Up-to-date

   Working revision:    1.455
   Repository revision: 1.455   /cvs/drupal/drupal/modules/Attic/comment.module,v
   Commit Identifier:   63f544513f9d4567
   Sticky Tag:          DRUPAL-4-7-0 (revision: 1.455)
   Sticky Date:         (none)
   Sticky Options:      (none)

===================================================================
File: comment.module    Status: Locally Modified

   Working revision:    1.520.2.2
   Repository revision: 1.520.2.2       /cvs/drupal/drupal/modules/comment/comment.module,v
   Commit Identifier:   52c545be6c664567
   Sticky Tag:          DRUPAL-5-1 (revision: 1.520.2.2)
   Sticky Date:         (none)
   Sticky Options:      (none)

ignore that 'locally modified' -- I have set the comment block to omit the time and to title the link with the title of the parent node, a small mod requested by my subscribers (I'll post the patch if anyone wants it)

Back at the mysteriously tenacious 4-7 comment.module, the tag appears to be set correctly:

$ cat modules/CVS/Tag 
TDRUPAL-5-1

yet when I delete the file and cvs update -dP again, it comes right back!