diff --git a/tutorials/tree/tree2a.C b/tutorials/tree/tree2a.C
index 67b487be3f716e043dc0cb6de3b50b173d76653d..d61cdc658ea954d0c3e2b2667fe23e8a4da124d4 100644
--- a/tutorials/tree/tree2a.C
+++ b/tutorials/tree/tree2a.C
@@ -7,7 +7,7 @@
 #include "TRandom.h"
 #include "TCanvas.h"
 
-// This example is the same as tree2.C, but uses a class instead of a C-struct.
+//+ This example is the same as tree2.C, but uses a class instead of a C-struct.
 // In this example, we are mapping a class to one of the Geant3
 // common blocks /gctrak/. In the real life, this common will be filled
 // by Geant3 at each step and only the Tree Fill function should be called.