diff --git a/_includes/head.html b/_includes/head.html
index edec4b1..6407c9c 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -113,4 +113,7 @@
   {% unless site.theme_mode %}
     {% include mode-toggle.html %}
   {% endunless %}
+
+  {% include metadata-hook.html %}
+
 </head>
diff --git a/_includes/metadata-hook.html b/_includes/metadata-hook.html
new file mode 100644
index 0000000..fd7e9bd
--- /dev/null
+++ b/_includes/metadata-hook.html
@@ -0,0 +1 @@
+<!-- A placeholder to allow defining custom metadata -->