diff --git a/src/calibre/gui2/add.py b/src/calibre/gui2/add.py
index d48e962f90..234c72abf4 100644
--- a/src/calibre/gui2/add.py
+++ b/src/calibre/gui2/add.py
@@ -11,7 +11,7 @@ from calibre.gui2.dialogs.progress import ProgressDialog
 from calibre.gui2 import (question_dialog, error_dialog, info_dialog, gprefs,
         warning_dialog, available_width)
 from calibre.ebooks.metadata.opf2 import OPF
-from calibre.ebooks.metadata import MetaInformation
+from calibre.ebooks.metadata import MetaInformation, authors_to_string
 from calibre.constants import preferred_encoding, filesystem_encoding, DEBUG
 from calibre.utils.config import prefs
 from calibre import prints, force_unicode, as_unicode
@@ -382,12 +382,25 @@ class Adder(QObject): # {{{
         if not duplicates:
             return self.duplicates_processed()
         self.pd.hide()
-        files = [_('%(title)s by %(author)s')%dict(title=x[0].title,
-            author=x[0].format_field('authors')[1]) for x in duplicates]
+        duplicate_message = []
+        for x in duplicates:
+            duplicate_message.append(_('Already in calibre:'))
+            matching_books = self.db.books_with_same_title(x[0])
+            for book_id in matching_books:
+                aut = [a.replace('|', ',') for a in (self.db.authors(book_id,
+                    index_is_id=True) or '').split(',')]
+                duplicate_message.append('\t'+ _('%(title)s by %(author)s')%
+                        dict(title=self.db.title(book_id, index_is_id=True),
+                        author=authors_to_string(aut)))
+            duplicate_message.append(_('You are trying to add:'))
+            duplicate_message.append('\t'+_('%(title)s by %(author)s')%
+                    dict(title=x[0].title,
+                    author=x[0].format_field('authors')[1]))
+            duplicate_message.append('')
         if question_dialog(self._parent, _('Duplicates found!'),
                         _('Books with the same title as the following already '
-                        'exist in the database. Add them anyway?'),
-                        '\n'.join(files)):
+                        'exist in calibre. Add them anyway?'),
+                        '\n'.join(duplicate_message)):
             pd = QProgressDialog(_('Adding duplicates...'), '', 0, len(duplicates),
                     self._parent)
             pd.setCancelButton(None)