Using an arrow is not too reliable, because shapes aren't tied to points in the
chart, and they move around sometimes at random. What you could do is add a data
label to a point, as follows. Select the series then the point (two single clicks).
Press the shortcut Ctrl+1 to format the point, and on the Data Labels tab, add a
data label, using any of the options (Series Name is fine). Select the label (two
single clicks), then click on the text to get a cursor flashing in it. Replace the
text of the label with something meaningful, perhaps just the "N" from the indicator
cell.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
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sbigelow wrote:
Is there a way to add indicators such as an arrow on a line chart? For
example, say I have a cell that contains, "N" and the date next to it
(the date is my label for the x axis). I want the "N" to be referenced
on the line chart as an arrow. Basically pointing to a spot on the line
chart. Thank for your help in advance.