diff --git a/index.html b/index.html
index 30c786d..63e7e4f 100644
--- a/index.html
+++ b/index.html
@@ -36,6 +36,19 @@
                     <a href="ch03_10.html"   data-role="button" rel="external">ch03_10.html</a>
                     <a href="ch03_11.html"   data-role="button" rel="external">ch03_11.html</a>
                     <a href="ch03_12.html"   data-role="button" rel="external">ch03_12.html</a>
+                    <a href="ch03_13.html"   data-role="button" rel="external">ch03_13.html</a>
+                    <a href="ch03_14.html"   data-role="button" rel="external">ch03_14.html</a>
+                    <a href="ch03_15.html"   data-role="button" rel="external">ch03_15.html</a>
+                    <a href="ch03_16.html"   data-role="button" rel="external">ch03_16.html</a>
+                    <a href="ch03_17.html"   data-role="button" rel="external">ch03_17.html</a>
+                    <a href="ch03_18.html"   data-role="button" rel="external">ch03_18.html</a>
+                    <a href="ch03_19.html"   data-role="button" rel="external">ch03_19.html</a>
+                    <a href="ch03_20.html"   data-role="button" rel="external">ch03_20.html</a>
+                    <a href="ch03_21.html"   data-role="button" rel="external">ch03_21.html</a>
+                    <a href="ch03_22.html"   data-role="button" rel="external">ch03_22.html</a>
+                    <a href="ch03_23.html"   data-role="button" rel="external">ch03_23.html</a>
+                    <a href="ch03_24.html"   data-role="button" rel="external">ch03_24.html</a>
+                    <a href="ch03_25.html"   data-role="button" rel="external">ch03_25.html</a>
                 </div>
             </div>
             <div data-role="footer" data-position="fixed">