Module 5: DYI audit picture

This is super minor thing, but I noticed that module 5 DYI audit picture (https://github.com/todogroup/ospo101/blob/main/module5/diy-audit.png) there is an asterisks (*) at Fingerprint collector tool -> digital signatures, but there is no "explanation" or "foot note" for this. 
The previous picture (Traditional audit) also had an asterisks and it also provided the foot note. 