[Python] adding a vertical line to plot using seaborn object interface

I am trying to use seaborn object interface. It looks intuitive like ggplot2 in R. However, since it is still in development stage, the underlying documentation is still WIP.

For example I am trying to add a vertical line at let's say x=5. How could I do so using the object interface.

import seaborn.objects as so
r=fmri[(fmri['event']=='stim') ].reset_index()
(
so.Plot(r, x="timepoint", y="signal",color='subject')
.facet(row="region", wrap=2)
.add(so.Line())
)

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