Many man pages end with:
The full documentation for Ed is maintained as a Texinfo manual. If the info > and XYZ programs are properly installed at your site, the commandinfo XYZ should give you access to the complete manual.
I have problems with that. 1. I don't want to install unneeded packages just to find out whether or not the package might be useful. 2. The info output has an annoying format. A browser acceptable format {plain text fine -- HTML *NOT* needed} is MUCH more functional.