Issue #26638: Cannot directly link to main option from the “timeit” module
This seems to be because the “timeit” module defines its own set of options
diff --git a/Doc/library/timeit.rst b/Doc/library/timeit.rst
index e7b3548..7957910 100644
--- a/Doc/library/timeit.rst
+++ b/Doc/library/timeit.rst
@@ -232,7 +232,8 @@
The code here doesn't try to hide it, but you should be aware of it. The
baseline overhead can be measured by invoking the program without arguments, and
it might differ between Python versions. Also, to fairly compare older Python
- versions to Python 2.3, you may want to use Python's :option:`-O` option for
+ versions to Python 2.3, you may want to use Python's :option:`!-O`
+ option (see :ref:`Optimizations <using-on-optimizations>`) for
the older versions to avoid timing ``SET_LINENO`` instructions.