Acl2 Version 1.1 Notes
Major Section:  RELEASE-NOTES

The new features are extensively documented. The relevant topics are:

Some Related Topics

It is especially important to read all of 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.