Document backoff locks

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #16 (f67317e) into main (f6174aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   86.66%   86.66%           
=======================================
  Files           9        9           
  Lines         315      315           
=======================================
  Hits          273      273           
  Misses         42       42           

Flag	Coverage Δ
Pkg.test	86.66% <ø> (ø)

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