diff --git a/app.yaml b/app.yaml
new file mode 100644
index 0000000..3c40271
--- /dev/null
+++ b/app.yaml
@@ -0,0 +1,40 @@
+runtime: python27
+version: 1
+api_version: 1
+application: cosmopolite-root
+threadsafe: true
+
+handlers:
+- url: /
+  static_files: index.html
+  upload: index.html
+  secure: always
+  http_headers:
+    X-Frame-Options: DENY
+    X-Content-Type-Options: nosniff
+    Strict-Transport-Security: max-age=31536000; includeSubDomains
+
+- url: /tutorial
+  static_files: tutorial.html
+  upload: tutorial.html
+  secure: always
+  http_headers:
+    X-Frame-Options: DENY
+    X-Content-Type-Options: nosniff
+    Strict-Transport-Security: max-age=31536000; includeSubDomains
+
+- url: /images
+  static_dir: images
+  secure: always
+  http_headers:
+    X-Frame-Options: DENY
+    X-Content-Type-Options: nosniff
+    Strict-Transport-Security: max-age=31536000; includeSubDomains
+
+- url: /stylesheets
+  static_dir: stylesheets
+  secure: always
+  http_headers:
+    X-Frame-Options: DENY
+    X-Content-Type-Options: nosniff
+    Strict-Transport-Security: max-age=31536000; includeSubDomains
diff --git a/index.html b/index.html
index c2be15b..e677849 100644
--- a/index.html
+++ b/index.html
@@ -30,7 +30,7 @@
 <h3>Dig in</h3>
 
 <ul>
-  <li style="font-weight: bold;">Read <a href="tutorial.html">the tutorial</a></li>
+  <li style="font-weight: bold;">Read <a href="tutorial">the tutorial</a></li>
   <li style="font-weight: bold;">Try out <a href="https://playground.cosmopolite.org/cosmopolite/static/debug.html">the playground</a></li>
 </ul>