diff --git a/docs/CNAME b/docs/CNAME
new file mode 100644
index 0000000..475134c
--- /dev/null
+++ b/docs/CNAME
@@ -0,0 +1 @@
+devbox.foobarto.me
diff --git a/test/site_test.py b/test/site_test.py
index 3070097..9537323 100644
--- a/test/site_test.py
+++ b/test/site_test.py
@@ -96,6 +96,7 @@ def test_site_version_updater_rejects_duplicate_markers(self):
     def test_pages_source_contains_the_static_site_and_disables_jekyll(self):
         self.assertTrue((SITE / ".nojekyll").is_file())
         self.assertTrue((SITE / "index.html").is_file())
+        self.assertEqual("devbox.foobarto.me\n", (SITE / "CNAME").read_text(encoding="utf-8"))
 
     def test_version_sync_workflow_updates_and_deploys_only_when_needed(self):
         workflow = (ROOT / ".github/workflows/sync-site-version.yml").read_text(encoding="utf-8")