diff --git a/frontend/pages/tools.vue b/frontend/pages/tools.vue
index 98bfe30..ce5ea1f 100644
--- a/frontend/pages/tools.vue
+++ b/frontend/pages/tools.vue
@@ -42,8 +42,10 @@
         <div class="border-t px-6 pb-3 border-gray-300 divide-gray-300 divide-y">
           <DetailAction @action="modals.import = true">
             <template #title>Import Inventory</template>
-            Imports the standard CSV format for Homebox. This will <b>not</b> overwrite any existing items in your
-            inventory. It will only add new items.
+            Imports the standard CSV format for Homebox. Without an <code>HB.import_ref</code>
+            column, this will <b>not</b> overwrite any existing items in your inventory, only add new items.
+            Rows with an <code>HB.import_ref</code> column are merged into existing items with the same import_ref,
+            if one exists.
           </DetailAction>
           <DetailAction @action="getExportTSV()">
             <template #title>Export Inventory</template>