The purpose of this sphinx extension is enable markup of requirements per the definitions in RFC 2119.
This is supported by a suite of requirement directives that correspond to the RFC 2119 keywords. There are also a suite of requirement list directives that support documenting reqiurements (that have been defined with the rfc2119 directives).
This module is in ALPHA status. Feedback / pull requests very welcome. Development occurs on GitHub:
Documentation is a bit strange - I used the directives to document what it is supposed to do. Which was handy as I made it, but probably not very readable.
Basically, add the module to your the conf.py of your repo then use the directives. They have lower case names.
This sphinx extention is very simple, like RFC 2119.
If you want a more complex graph of requirement types, perhaps https://sphinx-needs.readthedocs.io/ will suit you better.