--- a/mercurial/commands.py	Sun Apr 12 23:51:06 2015 -0700
+++ b/mercurial/commands.py	Fri May 15 09:46:21 2015 +0200
@@ -4952,11 +4952,11 @@
      ('f', 'force', False, _('allow to move boundary backward')),
      ('r', 'rev', [], _('target revision'), _('REV')),
     ],
-    _('[-p|-d|-s] [-f] [-r] REV...'))
+    _('[-p|-d|-s] [-f] [-r] [REV...]'))
 def phase(ui, repo, *revs, **opts):
     """set or show the current phase name
 
-    With no argument, show the phase name of specified revisions.
+    With no argument, show the phase name of the current revision(s).
 
     With one of -p/--public, -d/--draft or -s/--secret, change the
     phase value of the specified revisions.
@@ -4981,7 +4981,9 @@
     revs = list(revs)
     revs.extend(opts['rev'])
     if not revs:
-        raise util.Abort(_('no revisions specified'))
+        # display both parents as the second parent phase can influence
+        # the phase of a merge commit
+        revs = [c.rev() for c in repo[None].parents()]
 
     revs = scmutil.revrange(repo, revs)
 

--- a/tests/test-phases.t	Sun Apr 12 23:51:06 2015 -0700
+++ b/tests/test-phases.t	Fri May 15 09:46:21 2015 +0200
@@ -36,6 +36,8 @@
 Draft commit are properly created over public one:
 
   $ hg phase --public .
+  $ hg phase
+  1: public
   $ hglog
   1 0 B
   0 0 A
@@ -86,6 +88,9 @@
   $ hg merge 4 # E
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
+  $ hg phase
+  6: draft
+  4: secret
   $ hg ci -m "merge B' and E"
   $ hglog
   7 2 merge B' and E