Documentation Link

https://matplotlib.org/devdocs/api/_as_gen/matplotlib.axes.Axes.axvline.html#matplotlib.axes.Axes.axvline

Problem

The documentation for the first argument, x of axhline describes it as

but really it sets x rather than y.

Suggested improvement

        x : float, default: 0
            x position in :ref:`data coordinates <coordinate-systems>`.