diff --git a/testcases/Naturals.scala b/testcases/Naturals.scala
index 8b626b67276e71687fda7f265cefb15c8c8397c4..8f9ea83156cc9ea3d37652b33dacf74ae387fe06 100644
--- a/testcases/Naturals.scala
+++ b/testcases/Naturals.scala
@@ -33,6 +33,10 @@ object Naturals {
       plus(Zero(), x) ==  plus(x, Zero()) 
     } holds
 
+
+// induction is made on first parameter
+//induction on x works here!
+//induction on y = stack overflow
     @induct
     def oneCommut(x : Nat, y : Nat) : Boolean = {
       Succ(plus(x,y)) ==  plus(x, Succ(y))