diff --git a/subcmds/manifest.py b/subcmds/manifest.py
index cd19653..4388765 100644
--- a/subcmds/manifest.py
+++ b/subcmds/manifest.py
@@ -48,6 +48,11 @@
     p.add_option('-r', '--revision-as-HEAD',
                  dest='peg_rev', action='store_true',
                  help='Save revisions as current HEAD')
+    p.add_option('--suppress-upstream-revision', dest='peg_rev_upstream',
+                 default=True, action='store_false',
+                 help='If in -r mode, do not write the upstream field.  '
+                 'Only of use if the branch names for a sha1 manifest are '
+                 'sensitive.')
     p.add_option('-o', '--output-file',
                  dest='output_file',
                  default='-',
@@ -60,7 +65,8 @@
     else:
       fd = open(opt.output_file, 'w')
     self.manifest.Save(fd,
-                       peg_rev = opt.peg_rev)
+                       peg_rev = opt.peg_rev,
+                       peg_rev_upstream = opt.peg_rev_upstream)
     fd.close()
     if opt.output_file != '-':
       print >>sys.stderr, 'Saved manifest to %s' % opt.output_file