diff --git a/src/calibre/manual/faq.rst b/src/calibre/manual/faq.rst
index d3784eda6f..b120fd4a1b 100644
--- a/src/calibre/manual/faq.rst
+++ b/src/calibre/manual/faq.rst
@@ -138,7 +138,7 @@ Follow these steps to find the problem:
 My device is non-standard or unusual. What can I do to connect to it?
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-In addition to the :guilabel:`Connect to Folder` function found under the Connect/Share button, |app| provides a ``User Defined`` device plugin that can be used to connect to any USB device that presents that shows up as a disk drive in your operating system. See the device plugin ``Preferences -> Plugins -> Device Plugins -> User Defined`` and ``Preferences -> Miscellaneous -> Get information to setup the user defined device`` for more information.
+In addition to the :guilabel:`Connect to Folder` function found under the Connect/Share button, |app| provides a ``User Defined`` device plugin that can be used to connect to any USB device that shows up as a disk drive in your operating system. Note: on windows, the device must have a drive letter for calibre to use it. See the device plugin ``Preferences -> Plugins -> Device Plugins -> User Defined`` and ``Preferences -> Miscellaneous -> Get information to setup the user defined device`` for more information.
 
 How does |app| manage collections on my SONY reader?
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