diff --git a/static/source.html b/static/source.html
index 72164ee3..37ea6cbc 100644
--- a/static/source.html
+++ b/static/source.html
@@ -32,6 +32,11 @@
             references all of these. Most of these are used unmodified from the Android Open
             Source Project (AOSP). A few dozen of the repositories are either forked from AOSP or
             are unique to GrapheneOS.</p>
+            <p>Chromium needs to be included in the GrapheneOS source tree as a prebuilt before
+            building. The build metadata is in the <a href="https://github.com/GrapheneOS/chromium_build">
+            chromium_build repository</a> and the GrapheneOS patches are in the
+            <a href="https://github.com/GrapheneOS/chromium_patches">chromium_patches repository</a>.
+            See the GrapheneOS building instructions for more details.</p>
             <p>See <a href="https://attestation.app/source">https://attestation.app/source</a>
             for the Auditor and AttestationServer sources. The latest release of the Auditor app
             is included in the GrapheneOS source tree as a prebuilt since it uses a different