Note-1-1
Acl2 Version 1.1 Notes
The new features are extensively documented. The relevant topics
are:
It is especially important to read all of the documentation for
books before trying to use books. However, the new :more keyword
command is so handy for reading long documentation strings that we
recommend you start with :doc more if reading at the terminal.
Some documentation has been written for guards which you might find
interesting.