diff --git a/frontend/templates/_analysis.html b/frontend/templates/_analysis.html
index 7b15b41..5dd8484 100644
--- a/frontend/templates/_analysis.html
+++ b/frontend/templates/_analysis.html
@@ -43,7 +43,11 @@
         <input type="number" name="target_disk_size_gb" class="pve-input"
                value="{{ analysis.disk_size_gb }}"
                placeholder="Leave blank for auto-shrink">
-        <span class="pve-hint">{{ analysis.disk_size_gb }} GB detected. Omit to auto-shrink (10% of size, min 20 GB).</span>
+        <span class="pve-hint">
+          {{ analysis.disk_size_gb }} GB detected. Auto-shrink to {{ (analysis.disk_size_gb * 0.1)|round(0)|int if (analysis.disk_size_gb * 0.1) > 20 else 20 }} GB if left blank.<br>
+          <strong>Warning:</strong> shrinking can break complex layouts (LVM, encryption).
+          If unsure, enter the full size ({{ analysis.disk_size_gb }} GB) to skip.
+        </span>
       </div>
     </div>
     <div class="pve-row">