1 files changed, 50 insertions, 3 deletions

diff --git a/index.html b/index.html
index f9bd6b7..9b917af 100644
--- a/index.html
+++ b/index.html
@@ -233,13 +233,60 @@
   
   
   
+    
+    <li class="md-nav__item md-nav__item--nested">
+      
+      
+        <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_2" type="checkbox" id="__nav_2" >
+      
+      
+      
+      
+        <label class="md-nav__link" for="__nav_2">
+          Code
+          <span class="md-nav__icon md-icon"></span>
+        </label>
+      
+      <nav class="md-nav" aria-label="Code" data-md-level="1">
+        <label class="md-nav__title" for="__nav_2">
+          <span class="md-nav__icon md-icon"></span>
+          Code
+        </label>
+        <ul class="md-nav__list" data-md-scrollfix>
+          
+            
+              
+  
+  
+  
     <li class="md-nav__item">
-      <a href="code/" class="md-nav__link">
+      <a href="code/classes/" class="md-nav__link">
+        Classes
+      </a>
+    </li>
+  
+
+            
+          
+            
+              
+  
+  
+  
+    <li class="md-nav__item">
+      <a href="code/intro/" class="md-nav__link">
         Code documentation
       </a>
     </li>
   
 
+            
+          
+        </ul>
+      </nav>
+    </li>
+  
+
     
   </ul>
 </nav>
@@ -312,13 +359,13 @@
       
       
         
-        <a href="code/" class="md-footer__link md-footer__link--next" aria-label="Next: Code documentation" rel="next">
+        <a href="code/classes/" class="md-footer__link md-footer__link--next" aria-label="Next: Classes" rel="next">
           <div class="md-footer__title">
             <div class="md-ellipsis">
               <span class="md-footer__direction">
                 Next
               </span>
-              Code documentation
+              Classes
             </div>
           </div>
           <div class="md-footer__button md-icon">