diff --git a/unittest/python/test_MINRES.py b/unittest/python/test_MINRES.py
index 67cbfac96376ed56e3841dc99868467326318956..307ab3c513c3bbac1582b6360e9e54b8fd16a9d1 100644
--- a/unittest/python/test_MINRES.py
+++ b/unittest/python/test_MINRES.py
@@ -11,4 +11,6 @@ minres = eigenpy.MINRES(A)
 X = np.random.rand(dim,20)
 B = A.dot(X)
 X_est = minres.solve(B)
+print("A.dot(X_est):",A.dot(X_est))
+print("B:",B)
 assert eigenpy.is_approx(A.dot(X_est),B,1e-6)