diff --git a/docs/reference/gdk/gdk-docs.sgml b/docs/reference/gdk/gdk-docs.sgml
index bdd7a7af89..87573e2087 100644
--- a/docs/reference/gdk/gdk-docs.sgml
+++ b/docs/reference/gdk/gdk-docs.sgml
@@ -101,6 +101,10 @@
     <title>Index of new symbols in 3.18</title>
     <xi:include href="xml/api-index-3.18.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-3-20" role="3.20">
+    <title>Index of new symbols in 3.20</title>
+    <xi:include href="xml/api-index-3.20.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
 
diff --git a/docs/reference/gtk/gtk-docs.sgml b/docs/reference/gtk/gtk-docs.sgml
index 3b975641be..d095c2f208 100644
--- a/docs/reference/gtk/gtk-docs.sgml
+++ b/docs/reference/gtk/gtk-docs.sgml
@@ -482,6 +482,10 @@
     <title>Index of new symbols in 3.18</title>
     <xi:include href="xml/api-index-3.18.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-3-20" role="3.20">
+    <title>Index of new symbols in 3.20</title>
+    <xi:include href="xml/api-index-3.20.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>