--- a/mercurial/commands.py	Tue Jan 10 13:48:42 2012 -0600
+++ b/mercurial/commands.py	Tue Jan 10 10:18:19 2012 +0200
@@ -299,6 +299,9 @@
             for p, l in zip(zip(*pieces), lines):
                 ui.write("%s: %s" % ("".join(p), l[1]))
 
+            if lines and not lines[-1][1].endswith('\n'):
+                ui.write('\n')
+
 @command('archive',
     [('', 'no-decode', None, _('do not pass files through decoders')),
     ('p', 'prefix', '', _('directory prefix for files in archive'),