diff --git a/doc/notebooks/09_tutorial_shanchen_twocomponent.ipynb b/doc/notebooks/09_tutorial_shanchen_twocomponent.ipynb
index 526db1ebfa4268bddb45c2df44b95f0de8c20df0..077e53f808699e1caea33ea85eac33da29ff2b33 100644
--- a/doc/notebooks/09_tutorial_shanchen_twocomponent.ipynb
+++ b/doc/notebooks/09_tutorial_shanchen_twocomponent.ipynb
@@ -255,6 +255,9 @@
     "\n",
     "    dh.fill(ρ_b.name, 0.9, slice_obj=ps.make_slice[:, :0.5])\n",
     "    dh.fill(ρ_b.name, 0.1, slice_obj=ps.make_slice[:, 0.5:])\n",
+    "    \n",
+    "    dh.fill(f_a.name, 0.0)\n",
+    "    dh.fill(f_b.name, 0.0)\n",
     "\n",
     "    dh.run_kernel(init_a_kernel)\n",
     "    dh.run_kernel(init_b_kernel)\n",