diff --git a/skluc/main/tensorflow_/kernel.py b/skluc/main/tensorflow_/kernel.py
index 0f8f9a0c6b795d4fc45b7ca9dcfd9c41090cf46b..352dfa9b3d749242b5d12feb4e7f1e71c3d0c01c 100644
--- a/skluc/main/tensorflow_/kernel.py
+++ b/skluc/main/tensorflow_/kernel.py
@@ -26,6 +26,8 @@ def tf_rbf_kernel(X, Y, gamma):
 
 
 def tf_linear_kernel(X, Y):
+    # X = tf.nn.l2_normalize(X, axis=-1)
+    # Y = tf.nn.l2_normalize(Y, axis=-1)
     return tf.matmul(X, tf.transpose(Y))
 
 def tf_polynomial_kernel(X, Y, degree=2, gamma=None, **kwargs):