diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -578,7 +578,9 @@ class PullrequestsController(BaseRepoCon
                 avail_revs = org_scm_instance._repo.revs('%s:: & branch(%s)',
                                                          revs[0], c.cs_branch_name)
                 if len(avail_revs) > 1: # more than just revs[0]
-                    show = set(avail_revs)
+                    # also show changesets that not are descendants but would be merged in
+                    show = set(org_scm_instance._repo.revs('::%ld & !::%s & !::%s',
+                                                           avail_revs, revs[0], c.a_branch_name))
                     c.update_msg = _('This pull request can be updated with changes on %s:') % c.cs_branch_name
                 else:
                     show = set()
diff --git a/kallithea/templates/pullrequests/pullrequest_show.html b/kallithea/templates/pullrequests/pullrequest_show.html
--- a/kallithea/templates/pullrequests/pullrequest_show.html
+++ b/kallithea/templates/pullrequests/pullrequest_show.html
@@ -189,7 +189,7 @@ ${self.repo_context_bar('showpullrequest
                         <td colspan="2">${_("Current revision - no change")}</td>
                       %else:
                         <td>
-                          %if editable:
+                          %if editable and cs.revision in c.avail_revs:
                             ${h.radio(name='updaterev', value=cs.raw_id)}
                           %endif
                         </td>