diff --git a/content/Week_1_4/WS_1_4_solution.ipynb b/content/Week_1_4/WS_1_4_solution.ipynb
index 8cdce00ae2b39b7c37fd48a61c3b2f210565f945..1f0351bed1d9fb6ccbe775d9ea3077a34c32a341 100644
--- a/content/Week_1_4/WS_1_4_solution.ipynb
+++ b/content/Week_1_4/WS_1_4_solution.ipynb
@@ -311,7 +311,7 @@
    "outputs": [],
    "source": [
     "def partial_derivatives(times, rainy_days, rain, d_i, a_i, r_i):\n",
-    "    '''Compute partial derivates\n",
+    "    '''Compute partial derivatives\n",
     "    \n",
     "    Input:\n",
     "    times : array with observation times\n",