diff --git a/python/1_7_Variables.ipynb b/python/1_7_Variables.ipynb
index 19c6418..70da46c 100644
--- a/python/1_7_Variables.ipynb
+++ b/python/1_7_Variables.ipynb
@@ -205,7 +205,7 @@
    },
    "outputs": [],
    "source": [
-    "# Exercise inmutable type\n",
+    "# Exercise mutable type\n",
     "a = [1, 2, 3]\n",
     "b = a\n",
     "a.append(4)\n",