tests: update docs for updating screenshot tests
diff --git a/tests/README.md b/tests/README.md
index 7f9fdfb..9b1d2bd 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -94,6 +94,13 @@
are suitable for tests with data that is consistent between environments or
static pages.
+### Updating the tests
+
+Update screen shot diffs using the following:
+
+1. Run `./tests/screentest/run.sh ci -update` to collect the updated screenshots.
+2. Copy the new screenshots from `./tests/screentest/output` into `./tests/screentest/testdata/testcases`
+
### Understanding Test Failures
If the tests fail with diffs, a file with the diffs will be created in the
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1. Run `./tests/screentest/run.sh ci -update` to collect the updated screenshots.Mention `-run`.
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1. Run `./tests/screentest/run.sh ci -update` to collect the updated screenshots.Ethan LeeMention `-run`.
Done
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kokoro rerun
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