diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -5991,6 +5991,15 @@ def summary(ui, repo, **opts):
                 ui.write(_(' (empty repository)'))
             else:
                 ui.write(_(' (no revision checked out)'))
+        if p.troubled():
+            ui.write(' (')
+            troubles = p.troubles()
+            for idx, trouble in enumerate(troubles, 1):
+                ui.write(trouble,
+                         label='trouble.%s' % trouble)
+                if idx < len(troubles):
+                    ui.write(', ')
+            ui.write(')')
         ui.write('\n')
         if p.description():
             ui.status(' ' + p.description().splitlines()[0].strip() + '\n',
diff --git a/tests/test-obsolete.t b/tests/test-obsolete.t
--- a/tests/test-obsolete.t
+++ b/tests/test-obsolete.t
@@ -242,7 +242,7 @@ Fixing "bumped" situation
 We need to create a clone of 5 and add a special marker with a flag
 
   $ hg summary
-  parent: 5:5601fb93a350 tip
+  parent: 5:5601fb93a350 tip (bumped)
    add new_3_c
   branch: default
   commit: (clean)
@@ -477,7 +477,7 @@ detect outgoing obsolete and unstable
   $ hg log -r 'obsolete()'
   4:94b33453f93b (draft) [ ] add original_d
   $ hg summary
-  parent: 5:cda648ca50f5 tip
+  parent: 5:cda648ca50f5 tip (unstable)
    add original_e
   branch: default
   commit: (clean)
@@ -825,6 +825,20 @@ test the default cmdline template
   summary:     add babar
   
 
+test summary output
+
+  $ hg up -r 'bumped() and unstable()'
+  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg summary
+  parent: 7:50c51b361e60  (unstable, bumped)
+   add babar
+  branch: default
+  commit: 3 unknown (clean)
+  update: 2 new changesets (update)
+  phases: 4 draft
+  unstable: 2 changesets
+  bumped: 1 changesets
+
 Test incoming/outcoming with changesets obsoleted remotely, known locally
 ===============================================================================
 
diff --git a/tests/test-rebase-obsolete.t b/tests/test-rebase-obsolete.t
--- a/tests/test-rebase-obsolete.t
+++ b/tests/test-rebase-obsolete.t
@@ -761,7 +761,7 @@ If a rebase is going to create divergenc
   o  0:4a2df7238c3b A
   
   $ hg summary
-  parent: 15:73568ab6879d tip
+  parent: 15:73568ab6879d tip (unstable)
    bar foo
   branch: default
   commit: (clean)