Another small update to the top-level README.txt file

README.txt

@@ -161,8 +161,8 @@ Ubuntu Bash under Windows 10
   Now that you completed the installation and setup, you can open the Bash
   tool from the Start menu like you would with any other app.
 
-  Accessing Windows Files
-  -----------------------
+  Accessing Windows Files from Ubuntu
+  -----------------------------------
   File sysems will be mounted under "/mnt" so for example "C:\Program Files"
   appears at "/mnt/c/Program Files".  This is as opposed to Cgwin where
   the same directory would appear at "/cygdrive/c/Program Files".
@@ -173,6 +173,17 @@ Ubuntu Bash under Windows 10
   setting the host to either Linux or Cygwin in your configuratino file
   should work fine.
 
+  Accessing Ubuntu Files From Windows
+  -----------------------------------
+  In Ubuntu Userspace for Windows, the Ubuntu file system root directory is
+  at:
+
+    %localappdata%\lxss\rootfs
+
+  Or
+
+    C:\Users\Username\AppData\Local\lxss\rootfs
+
   Install Linux Software.
   -----------------------
   Use "sudo apt-get install <package name>".  As examples, this is how