Index: /trunk/doc/manual/en_US/user_GuestAdditions.xml
===================================================================
--- /trunk/doc/manual/en_US/user_GuestAdditions.xml	(revision 85917)
+++ /trunk/doc/manual/en_US/user_GuestAdditions.xml	(revision 85918)
@@ -1558,4 +1558,13 @@
         will not work with Windows Explorer, which runs with regular
         user privileges by default.
+      </para>
+
+      <para>
+        On Linux hosts and guests, programs can query for drag and drop
+        data while the drag operation still is in progress (e.g. on LXDE
+        using the PCManFM file manager). This currently is not supported.
+
+        As a workaround, a different file manager (e.g. Nautilus) can 
+        be used instead.
       </para>