diff --git a/interface/wx/combo.h b/interface/wx/combo.h
index 38ef1f9342..25e1ef7756 100644
--- a/interface/wx/combo.h
+++ b/interface/wx/combo.h
@@ -310,6 +310,7 @@ struct wxComboCtrlFeatures
     @event{EVT_COMBOX_CLOSEUP(id, func)}
            Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
            when the popup window of the combo control disappears (closes up).
+           You should avoid adding or deleting items in this event.
     @endEventTable
 
     @library{wxbase}
diff --git a/interface/wx/combobox.h b/interface/wx/combobox.h
index 93e7f3eee7..1cdc7125aa 100644
--- a/interface/wx/combobox.h
+++ b/interface/wx/combobox.h
@@ -63,7 +63,8 @@
            Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
            when the list box of the combo box disappears (closes up). This
            event is only generated for the same platforms as
-           wxEVT_COMMAND_COMBOBOX_DROPDOWN above.
+           wxEVT_COMMAND_COMBOBOX_DROPDOWN above. Also note that only wxMSW
+           supports adding or deleting items in this event.
     @endEventTable
 
     @library{wxcore}