diff --git a/C4/W1/assignment/C4W1_Assignment.ipynb b/C4/W1/assignment/C4W1_Assignment.ipynb
index 45e01044..2432d1ca 100644
--- a/C4/W1/assignment/C4W1_Assignment.ipynb
+++ b/C4/W1/assignment/C4W1_Assignment.ipynb
@@ -384,7 +384,7 @@
     "id": "35gIlQLfu0TT"
    },
    "source": [
-    "**You should see that the naive forecast lags 1 step behind the time serie and that both series end on the same time step.**"
+    "**You should see that the naive forecast lags 1 step behind the time series and that both series end on the same time step.**"
    ]
   },
   {
@@ -463,7 +463,7 @@
     "    for time in range(len(series) - window_size):\n",
     "        forecast.append(series[time:time + window_size].mean())\n",
     "        \n",
-    "    # Conver to a numpy array\n",
+    "    # Convert to a numpy array\n",
     "    np_forecast = None\n",
     "    \n",
     "    ### END CODE HERE\n",