diff --git a/_config.yml b/_config.yml
index 494a531950..e4dd4631e7 100644
--- a/_config.yml
+++ b/_config.yml
@@ -12,4 +12,11 @@ defaults:
     scope:
       path: docs
     values:
-      layout: sidebar
\ No newline at end of file
+      layout: sidebar
+
+collections_dir: docs
+collections:
+  Mobile:
+    output: true
+    caption: Mobile-related
+    sidebar: true
\ No newline at end of file
diff --git a/_layouts/sidebar.html b/_layouts/sidebar.html
index ca8431b56f..2b9d260251 100644
--- a/_layouts/sidebar.html
+++ b/_layouts/sidebar.html
@@ -1,6 +1,14 @@
 ---
 layout: default
 ---
+{% for coll in site.collections %}
+    {% if coll.sidebar %}
+        <h2>{{ coll.caption }}</h2>
+        {% for page in coll.docs %}
+            <h3>{{ page.title | remove_first: coll.label | remove_first: '/ '}}</h3>
+        {% endfor %}
+    {% endif %}
+{% endfor %}
 <div class="container" style="padding-top: 24px;">
     <div class="row">
           <div class="col-md-3" id="toc" style="padding-top: 16px;">