diff --git a/tutorials/key_differences_between_python_2_and_3.ipynb b/tutorials/key_differences_between_python_2_and_3.ipynb
index c830a92..23a0fa4 100644
--- a/tutorials/key_differences_between_python_2_and_3.ipynb
+++ b/tutorials/key_differences_between_python_2_and_3.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:6381ed57a43484d7eb056ed84635101d586f95e11bbc8904b58f8d2c3c5693c3"
+  "signature": "sha256:2d1167e2155bc6be8905a13729dbbbcc240cb7281e18fac55b1c407b2d6271db"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -893,7 +893,7 @@
      "level": 3,
      "metadata": {},
      "source": [
-      "The `__contain__` method for `range` objects in Python 3"
+      "The `__contains__` method for `range` objects in Python 3"
      ]
     },
     {