--- a/client.py
+++ b/client.py
@@ -79,21 +79,23 @@ except IndexError:
 if action in ('checkout', 'co'):
     print >>sys.stderr, "Warning: client.py checkout is obsolete."
     pass
 elif action in ('update_nspr'):
     tag, = args[1:]
     if not options.cvsroot:
         options.cvsroot = os.environ.get('CVSROOT', CVSROOT_MOZILLA)
     do_cvs_export(NSPR_DIRS, tag, options.cvsroot, options.cvs)
+    print >>file("nsprpub/TAG-INFO", "w"), tag
 elif action in ('update_nss'):
     tag, = args[1:]
     if not options.cvsroot:
         options.cvsroot = os.environ.get('CVSROOT', CVSROOT_MOZILLA)
     do_cvs_export(NSS_DIRS, tag, options.cvsroot, options.cvs)
+    print >>file("security/nss/TAG-INFO", "w"), tag
 elif action in ('update_libffi'):
     tag, = args[1:]
     if not options.cvsroot:
         options.cvsroot = CVSROOT_LIBFFI
     do_cvs_export(LIBFFI_DIRS, tag, options.cvsroot, options.cvs)
 else:
     o.print_help()
     sys.exit(2)