diff --git a/aiidalab_widgets_base/structures.py b/aiidalab_widgets_base/structures.py
index 1433f314..4a0ee2d0 100644
--- a/aiidalab_widgets_base/structures.py
+++ b/aiidalab_widgets_base/structures.py
@@ -132,7 +132,7 @@ def __init__(
             structure_editors = ipw.VBox([btn_undo, structure_editors])
             accordion = ipw.Accordion([structure_editors])
             accordion.selected_index = None
-            accordion.set_title(0, "Edit Structure")
+            accordion.set_title(0, "Edit structure")
             children += [accordion]
 
         super().__init__(children=[*children, self.output], **kwargs)