diff --git a/stroll.html b/stroll.html
index 026518b..f0f77bc 100644
--- a/stroll.html
+++ b/stroll.html
@@ -416,7 +416,7 @@
             <div class="reveal-if-active">
               <li>
                 <label for="baseAnalVoreDiameter">Tailhole diameter</label>
-                <input autocomplete="off" type="number" step="any" id="baseAnalVoreDiameter" name="baseAnalVoreDiameter" data-unit="area" placeholder="0.1">
+                <input autocomplete="off" type="number" step="any" id="baseAnalVoreDiameter" name="baseAnalVoreDiameter" data-unit="length" placeholder="0.1">
                 <div class="preview" id="baseAnalVoreDiameterPreview"></div>
               </li>
               <li>