diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 104fddd174..fbab659271 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -42,6 +42,9 @@ jobs:
       - name: Build docs
         run: cd docs && mdbook build
 
+      - name: Copy CNAME to build output
+        run: cp docs/CNAME docs/book/CNAME
+
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:
diff --git a/docs/CNAME b/docs/CNAME
new file mode 100644
index 0000000000..70e277d2f3
--- /dev/null
+++ b/docs/CNAME
@@ -0,0 +1 @@
+cmux.io