Numbering between your version of mahaperinibbana & others

I have dutifully downloaded your amazing project of the suttas. In “a swift pair of messengers” on page 38 you have a marvelous quote regarding concentration pointed to note 5 in which you say is DN 22.21.

The problem is when I go to what I think is 22.21 in your EPUB the text is describing the aggregates. I am reading the number at the very bottom of the screen. I am making a stupid mistake I’m sure but please help.

I made a screen shot.

That’s the epub page number probably and will vary depending on the size of your screen, font, etc. It’s not useful as a reference number.

Perhaps the reference was intended to point here?