Patch roxygen

[khufkens]

small patches + docs

[codecov]

Codecov Report

Merging #63 (be375f2) into master (f2238b0) will not change coverage.
Report is 3 commits behind head on master.
The diff coverage is n/a.

❗ Current head be375f2 differs from pull request most recent head 8312583. Consider uploading reports for the commit 8312583 to get more accurate results

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files          11       11           
  Lines         453      453           
=======================================
  Hits          433      433           
  Misses         20       20           

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