137 explain systemfile

[mattfidler]

Closes #137
Closes #138

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dd09a17) 90.78% compared to head (5f5a697) 90.78%.

❗ Current head 5f5a697 differs from pull request most recent head 791b757. Consider uploading reports for the commit 791b757 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files          52       52           
  Lines        6260     6260           
=======================================
  Hits         5683     5683           
  Misses        577      577           

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