Add missing example

krp · krp · commit 60fd6f9c646f · 2022-03-29T22:50:06.000+13:00
diff --git a/README.md b/README.md
@@ -213,6 +213,10 @@ my_tuple.index("hello")
 my_tuple.index(3.14)
 my_tuple.index(False)
 my_tuple.index("blah")  # ValueError.
+
+
+# Trying to change the value of an item in a tuple causes an error.
+my_tuple[2] = "newvalue"  # TypeError.
 ```
 
 Lists.
