diff --git a/doc/kernel_implementation.rst b/doc/kernel_implementation.rst
index e98c33e2..327c001e 100644
--- a/doc/kernel_implementation.rst
+++ b/doc/kernel_implementation.rst
@@ -3,7 +3,8 @@
 List of implemented kernels
 ***************************
 
-======  ===========  ===  ======= =========== =============== ======= =========== ====== ====== ======
+======  ===========  ===  ======= =========== =============== ======= =========== ====== ====== =======
  NAME     get/set    K    Kdiag   dK_dtheta   dKdiag_dtheta   dK_dX   dKdiag_dX   psi0   psi1   psi2
 ======  ===========  ===  ======= =========== =============== ======= =========== ====== ====== =======
-rbf     \checkmark
+rbf     \\checkmark   y
+======  ===========  ===  ======= =========== =============== ======= =========== ====== ====== =======