diff --git a/src/components/molecules/YearHead.astro b/src/components/molecules/YearHead.astro
index b388b5d..dbd3555 100644
--- a/src/components/molecules/YearHead.astro
+++ b/src/components/molecules/YearHead.astro
@@ -8,7 +8,7 @@ const { year, count } = Astro.props;
 const formatted = String(count).padStart(2, "0");
 ---
 
-<div class="yearhead">
+<div class="yearhead" data-year-head>
   <span class="yr">{year}</span>
   <span class="ln"></span>
   <span class="n">{formatted}</span>