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I forget if you do this already.  I f it is not too much to ask  could you add a message as the last screen that says something along the lines of   "Now would be a good time to go back one screen and save for the next part."  ?  

(+1)

I believe it's already there!
There is a screen that tells you that you have reached the end of the available content.

Cool, It has been   a little  while since I  got to an ending so I did not remember.