diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index f3ef10f..2c4de66 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -22,7 +22,10 @@ jobs:
       uses: actions/checkout@v2
     - name: build
       run: |
-        xvfb-run make V=2 -O -j$(nproc) jekyll
+        set -xe
+        echo "sourceurl: https://github.com/$GITHUB_REPOSITORY" >> _config.yml
+        cat _config.yml
+        env JEKYLL_ENV=production xvfb-run make V=2 -O -j$(nproc) jekyll
     - if: github.event_name == 'push' && github.ref == 'refs/heads/main'
       name: publish
       run: |
diff --git a/_layouts/base.html b/_layouts/base.html
index a30ce33..d150c17 100644
--- a/_layouts/base.html
+++ b/_layouts/base.html
@@ -43,6 +43,9 @@
     <p>
     
     This 3D printable project is offered under <a href="{{ relative }}LICENSE.html">an open source license</a>.
+{% if site.sourceurl and site.sourceurl != "" %}
+    The source is managed at <a href="{{ site.sourceurl }}">{{ site.sourceurl }}</a>.
+{% endif %}
     The site is built with software under <a href="{{ relative }}other-licenses.html">various open source licenses</a>.
     
     Create your own MySTL site with <a href="https://github.com/jepler/cookiecutter-mystl">cookiecutter-mystl</a>.