diff --git a/ijs.tree b/ijs.tree
index 55e3253d7..fad004981 100644
--- a/ijs.tree
+++ b/ijs.tree
@@ -393,18 +393,22 @@
       <toc-element topic="api_changes_list_2024.md" toc-title="2024.*"/>
       <toc-element topic="api_changes_list_2023.md" toc-title="2023.*"/>
       <toc-element topic="api_changes_list_2022.md" toc-title="2022.*"/>
-      <toc-element topic="api_changes_list_2021.md" toc-title="2021.*"/>
-      <toc-element topic="api_changes_list_2020.md" toc-title="2020.*"/>
-      <toc-element topic="api_changes_list_2019.md" toc-title="2019.*"/>
+      <toc-element toc-title="Older Versions">
+        <toc-element topic="api_changes_list_2021.md" toc-title="2021.*"/>
+        <toc-element topic="api_changes_list_2020.md" toc-title="2020.*"/>
+        <toc-element topic="api_changes_list_2019.md" toc-title="2019.*"/>
+      </toc-element>
     </toc-element>
     <toc-element topic="api_notable.md" toc-title="Notable API Changes"
                  accepts-web-file-names="api-notable-list-2018.html">
       <toc-element topic="api_notable_list_2024.md" toc-title="2024.*"/>
       <toc-element topic="api_notable_list_2023.md" toc-title="2023.*"/>
       <toc-element topic="api_notable_list_2022.md" toc-title="2022.*"/>
-      <toc-element topic="api_notable_list_2021.md" toc-title="2021.*"/>
-      <toc-element topic="api_notable_list_2020.md" toc-title="2020.*"/>
-      <toc-element topic="api_notable_list_2019.md" toc-title="2019.*"/>
+      <toc-element toc-title="Older Versions">
+        <toc-element topic="api_notable_list_2021.md" toc-title="2021.*"/>
+        <toc-element topic="api_notable_list_2020.md" toc-title="2020.*"/>
+        <toc-element topic="api_notable_list_2019.md" toc-title="2019.*"/>
+      </toc-element>
     </toc-element>
     <toc-element topic="api_internal.md"/>
   </toc-element>