diff --git a/sopds/settings.py b/sopds/settings.py
index 48cab9f345ea42c857761376dfd37cde049a006c..c37e1de26d5ae7e2cd5dbeda7958ac5969a96e73 100644
--- a/sopds/settings.py
+++ b/sopds/settings.py
@@ -164,7 +164,7 @@ CONSTANCE_ADDITIONAL_FIELDS = {
 CONSTANCE_CONFIG = OrderedDict([
     ('SOPDS_LANGUAGE', ('en-US',_('Select language'),'language_select')),    
     ('SOPDS_ROOT_LIB', ('books/',_('Absolute path to books collection directory'))),
-    ('SOPDS_BOOK_EXTENSIONS', ('.pdf .djvu .fb2 .epub', _('List of managed book files extensions'))),
+    ('SOPDS_BOOK_EXTENSIONS', ('.pdf .djvu .fb2 .epub .mobi', _('List of managed book files extensions'))),
     ('SOPDS_SCAN_START_DIRECTLY', (False,_('Turn once scanning directly'))),
     
     ('SOPDS_AUTH', (True,_('Enable authentication'))),