If you are like me and like having a hard copy of things to reference to, here is a simple trick for printing out a copy of your rule sets, rules and their definitions.
First open your model and go to the Checking tab, and import the rule set you wish to print out.
Once this has been imported you will need to run the ruleset through the checking process. In the Results Summary Tab, click the Report button,
This will prompt you to give the file a name and location. You will need to save this in the CheckingSummaryTemplate.xls format which should be selected by default.
Once you have saved this file you can open it in Excel. You can delete out all the columns with the checking results included, leaving you with the columns containing the Ruleset, the Rules, contained within the Ruleset, and the definitions of what the rules are checking.
You can now format and print this out as required, or keep it as an electronic reference.