diff --git a/doc/theme/index.hbs b/doc/theme/index.hbs
index fa91f0b..31d22c6 100644
--- a/doc/theme/index.hbs
+++ b/doc/theme/index.hbs
@@ -112,6 +112,13 @@
             <div class="sidebar-scrollbox">
                 {{#toc}}{{/toc}}
             </div>
+            <div
+              id="sidebar-ad-placement"
+              class="flat"
+              data-ea-publisher="readthedocs"
+              data-ea-type="readthedocs-sidebar"
+              data-ea-manual="true"
+            ></div>
             <div id="sidebar-resize-handle" class="sidebar-resize-handle">
                 <div class="sidebar-resize-indicator"></div>
             </div>