diff --git a/docs/reference/gdk/gdk-docs.sgml b/docs/reference/gdk/gdk-docs.sgml
index eec922b884..81fd772b7b 100644
--- a/docs/reference/gdk/gdk-docs.sgml
+++ b/docs/reference/gdk/gdk-docs.sgml
@@ -112,9 +112,9 @@
     <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">
+  <index id="api-index-2-22" role="2.22">
     <title>Index of new symbols in 2.20</title>
-    <xi:include href="xml/api-index-2.20.xml"><xi:fallback /></xi:include>
+    <xi:include href="xml/api-index-2.22.xml"><xi:fallback /></xi:include>
   </index>
   <index id="api-index-3-0" role="3.0">
     <title>Index of new symbols in 3.0</title>