diff --git a/Doc/tutorial/introduction.rst b/Doc/tutorial/introduction.rst
index c0f4156436e..a99db19fe1b 100644
--- a/Doc/tutorial/introduction.rst
+++ b/Doc/tutorial/introduction.rst
@@ -296,11 +296,11 @@ position in the string results in an error::
    >>> word[0] = 'x'
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
-   TypeError: 'str' object doesn't support item assignment
+   TypeError: 'str' object does not support item assignment
    >>> word[:1] = 'Splat'
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
-   TypeError: 'str' object doesn't support slice assignment
+   TypeError: 'str' object does not support slice assignment
 
 However, creating a new string with the combined content is easy and efficient::