diff --git a/examples/tutorial_4_Pioneer.ipynb b/examples/tutorial_4_Pioneer.ipynb
index a47da355..5404931d 100644
--- a/examples/tutorial_4_Pioneer.ipynb
+++ b/examples/tutorial_4_Pioneer.ipynb
@@ -884,8 +884,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "power_flows['Electrical (solver)']= avg_elec_power  #solver determins sign\n",
-    "power_flows['Mechanical (solver)']= avg_mech_power - avg_fw_fric_power #solver determins sign, friction is dissipated\n",
+    "power_flows['Electrical (solver)']= avg_elec_power  #solver determines sign\n",
+    "power_flows['Mechanical (solver)']= avg_mech_power - avg_fw_fric_power #solver determines sign, friction is dissipated\n",
     "power_flows['PTO Loss'] = power_flows['Mechanical (solver)'] -  power_flows['Electrical (solver)'] "
    ]
   },