diff --git a/samples/treectrl/treetest.cpp b/samples/treectrl/treetest.cpp
index 2645bfdd1b..fd2ab7efe1 100644
--- a/samples/treectrl/treetest.cpp
+++ b/samples/treectrl/treetest.cpp
@@ -926,7 +926,7 @@ void MyTreeCtrl::OnEndLabelEdit(wxTreeEvent& event)
     // don't allow anything except letters in the labels
     if ( !event.GetLabel().IsWord() )
     {
-        wxMessageBox(wxT("The label should contain only letters."));
+        wxMessageBox(wxT("The new label should be a single word."));
 
         event.Veto();
     }