diff --git a/docs/reference/gdk/gdk-docs.sgml b/docs/reference/gdk/gdk-docs.sgml
index 1e0c7b51bc..eec922b884 100644
--- a/docs/reference/gdk/gdk-docs.sgml
+++ b/docs/reference/gdk/gdk-docs.sgml
@@ -112,6 +112,14 @@
     <title>Index of new symbols in 2.20</title>
     <xi:include href="xml/api-index-2.20.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-2-20" role="2.20">
+    <title>Index of new symbols in 2.20</title>
+    <xi:include href="xml/api-index-2.20.xml"><xi:fallback /></xi:include>
+  </index>
+  <index id="api-index-3-0" role="3.0">
+    <title>Index of new symbols in 3.0</title>
+    <xi:include href="xml/api-index-3.0.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>