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diff --git a/latest/development/contributing_guide.html b/latest/development/contributing_guide.html
index db99c37188..0129e77777 100644
--- a/latest/development/contributing_guide.html
+++ b/latest/development/contributing_guide.html
@@ -366,6 +366,7 @@ A safe example would be <code>WORKER_TYPES="federation_inbound, federation_
See the <a href="../workers.html">worker documentation</a> for additional information on workers.</li>
</ul>
</li>
+<li>Passing <code>ASYNCIO_REACTOR=1</code> as an environment variable to use the Twisted asyncio reactor instead of the default one.</li>
</ul>
<p>To increase the log level for the tests, set <code>SYNAPSE_TEST_LOG_LEVEL</code>, e.g:</p>
<pre><code class="language-sh">SYNAPSE_TEST_LOG_LEVEL=DEBUG COMPLEMENT_DIR=../complement ./scripts-dev/complement.sh -run TestImportHistoricalMessages
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