Add :term:s for descriptors.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index eb18c89..952adb2 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -169,7 +169,7 @@
 .. cmdoption:: -O
 
    Turn on basic optimizations.  This changes the filename extension for
-   compiled (:term:`byte code`) files from ``.pyc`` to ``.pyo``.  See also
+   compiled (:term:`bytecode`) files from ``.pyc`` to ``.pyo``.  See also
    :envvar:`PYTHONOPTIMIZE`.