diff --git a/docs/reference/gtk/gtk-docs.sgml b/docs/reference/gtk/gtk-docs.sgml
index bf8bfd9677..a0a35f5877 100644
--- a/docs/reference/gtk/gtk-docs.sgml
+++ b/docs/reference/gtk/gtk-docs.sgml
@@ -398,6 +398,10 @@
     <title>Index of new symbols in 3.4</title>
     <xi:include href="xml/api-index-3.4.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-3-6" role="3.6">
+    <title>Index of new symbols in 3.6</title>
+    <xi:include href="xml/api-index-3.6.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>