builtin -> built-in.
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index fb2f6fe..a629e5f 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -2819,7 +2819,7 @@
 often used in web applications. For more information about JSON, see
 http://www.json.org.
 
-:mod:`json` comes with support for decoding and encoding most builtin Python
+:mod:`json` comes with support for decoding and encoding most built-in Python
 types. The following example encodes and decodes a dictionary::
 
        >>> import json