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diff --git a/sphinx/themes/basic/sourcelink.html b/sphinx/themes/basic/sourcelink.html
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+++ b/sphinx/themes/basic/sourcelink.html
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+{#
+    basic/sourcelink.html
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    Sphinx sidebar template: "show source" link.
+
+    :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+#}
+{%- if show_source and has_source and sourcename %}
+  <div role="note" aria-label="source link">
+    <h3>{{ _('This Page') }}</h3>
+    <ul class="this-page-menu">
+      <li><a href="{{ pathto('_sources/' + sourcename, true)|e }}"
+            rel="nofollow">{{ _('Show Source') }}</a></li>
+    </ul>
+   </div>
+{%- endif %}