diff --git a/chapters/chap18.ipynb b/chapters/chap18.ipynb
index 41d5fc1..3027822 100644
--- a/chapters/chap18.ipynb
+++ b/chapters/chap18.ipynb
@@ -1661,7 +1661,7 @@
    "id": "07be77f3",
    "metadata": {},
    "source": [
-    "In this example, the value of `kwargs` is printed, but otherwise is has no effect.\n",
+    "In this example, the value of `kwargs` is printed, but otherwise it has no effect.\n",
     "\n",
     "But the `**` operator can also be used in an argument list to unpack a dictionary.\n",
     "For example, here's a version of `mean` that packs any keyword arguments it gets and then unpacks them as keyword arguments for `sum`."