builtin -> built-in.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 3c482a1..1762ddc 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -86,7 +86,7 @@
.. note::
- This option cannot be used with builtin modules and extension modules
+ This option cannot be used with built-in modules and extension modules
written in C, since they do not have Python module files. However, it
can still be used for precompiled modules, even if the original source
file is not available.