diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 3eeec567da..88002f18bb 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -3086,6 +3086,7 @@ class KOBOTOUCH(KOBO):
         if not self.supports_bookshelves:
             return bookshelves
 
+        # No idea why, but the newer database version seems to make this necessary
         if self.dbversion >= 188:
             query = 'SELECT Name FROM Shelf WHERE _IsDeleted = false'
         else: