This page links to different techniques to add horizontal and vertical lines to
column charts:

http://peltiertech.com/Excel/Charts/AddLine.html

You'll find that although setting them up may take slightly more effort, they will
more robustly denote the desired level than a drawing object added to the chart.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
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Doc_Fixer wrote:

How do I insert a marker on an Excel bar chart that represents a significant
point such as a goal or a minimum requirement for the data being charted?