Add preference to docstring

7 jobs for add-gps-tuple-method in 4 minutes and 27 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
passed #571083
documentation

00:01:22

passed #571079
example-ini-file-builds

00:00:44

passed #571081
example-ini-file-pesummary

00:02:34

passed #571080
injection-regression-test

00:04:25

passed #571077
precommits

00:01:31

passed #571082
python-3.6

00:01:25

passed #571078
python-3.7

00:01:21

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