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@@ -1,8 +1,41 @@
 # SyTest
 
 Dendrite uses [SyTest](https://github.com/matrix-org/sytest) for its
-integration testing. When creating a new PR, add the test IDs that your PR
-should allow to pass to `testfile` in dendrite's root directory. Not all PRs
-need to make new tests pass. If we find your PR should be making a test pass we
-may ask you to add to that file, as generally Dendrite's progress can be
+integration testing. When creating a new PR, add the test IDs (see below) that
+your PR should allow to pass to `testfile` in dendrite's root directory. Not all
+PRs need to make new tests pass. If we find your PR should be making a test pass
+we may ask you to add to that file, as generally Dendrite's progress can be
 tracked through the amount of SyTest tests it passes.
+
+## Finding out which tests to add
+
+An easy way to do this will be let CircleCI run sytest, and then search for the
+tests that should be added in the test results file.
+
+You may enable [CircleCI](https://circleci.com/) for your own fork, or simply
+refer to the CircleCI build for your PR. Once the build is complete, you can
+find the test results in `Container N/logs/results.tap` under the **Artifacts**
+tab on the CircleCI build page. To get the tests that should be added, search
+for the string:
+
+```
+# TODO passed but expected fail
+```
+
+Generally, tests with this label should be the tests that your PR is allowing to
+pass.
+
+To add a test into `testfile`, extract its test ID and append it to `testfile`.
+For example, to add this test:
+
+```
+ok 4 (expected fail) POST /register rejects registration of usernames with '!' # TODO passed but expected fail
+```
+
+Append:
+
+```
+POST /register rejects registration of usernames with '!'
+```
+
+to `testfile`.