I'm not sure if you have already figured this out, but there is an 
extremely simple solution.

This page has instructions for adding an annotation which did the job for 
me:

Add or edit a trendline or annotation 
> <https://support.google.com/docs/answer/6075154?hl=en>
>

The annotation allowed me add a note to any existing X or Y axis point.
Want to put it somewhere else?  Just add another row or column.

Hope this helps (5 yrs later)

On Wednesday, May 16, 2012 at 9:50:42 AM UTC-5, Jim wrote:
>
> Is it possible to add a vertical marker for a line / area chart?  For 
> example, say my x-axis range is 0-50 and I want to show a vertical 
> line at 33.  Is that possible?  I couldn't find this in the 
> documentation.

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