diff --git a/src/calibre/devices/usbms/device.py b/src/calibre/devices/usbms/device.py
index 2c0bcba937..97486aff19 100644
--- a/src/calibre/devices/usbms/device.py
+++ b/src/calibre/devices/usbms/device.py
@@ -287,6 +287,11 @@ class Device(DeviceConfig, DevicePlugin):
                     'cardb' in drives.keys():
                 break
 
+        # This is typically needed when the device has the same
+        # WINDOWS_MAIN_MEM and WINDOWS_CARD_A_MEM in which case
+        # if teh devices is connected without a crad, the above
+        # will incorrectly identify the main mem as carda
+        # See for example the driver for the Nook
         drives = self.windows_open_callback(drives)
 
         if drives.get('main', None) is None:
diff --git a/src/calibre/manual/faq.rst b/src/calibre/manual/faq.rst
index 5f342afc49..4f3155b8c8 100644
--- a/src/calibre/manual/faq.rst
+++ b/src/calibre/manual/faq.rst
@@ -81,7 +81,7 @@ Device Integration
 
 What devices does |app| support?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-At the moment |app| has full support for the SONY PRS 300/500/505/600/700, Cybook Gen 3/Opus, Amazon Kindle 1/2/DX, Netronix EB600, Ectaco Jetbook, BeBook/BeBook Mini, Irex Illiad/DR1000, Foxit eSlick, PocketBook 360, Android phones and the iPhone. In addition, using the :guilabel:`Save to disk` function you can use it with any ebook reader that exports itself as a USB disk.
+At the moment |app| has full support for the SONY PRS 300/500/505/600/700, Barnes & Noble Nook, Cybook Gen 3/Opus, Amazon Kindle 1/2/DX, Netronix EB600, Ectaco Jetbook, BeBook/BeBook Mini, Irex Illiad/DR1000, Foxit eSlick, PocketBook 360, Android phones and the iPhone. In addition, using the :guilabel:`Save to disk` function you can use it with any ebook reader that exports itself as a USB disk.
 
 How can I help get my device supported in |app|?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~