[R] text command - how to get a white background to cover grid lines

[Henry]

New to R - rookie question. 
I'm a mechanical engineer and enjoying using R to make high quality graphs. 

I've searched. 

I want to put text notation on graph plot areas and have the text background
"box" white to cover over the grid lines. 

my command so far.... 
text(15,5200,"Air Flow",cex=.8,col="blue", background="white") # this
doesn't work... 

I've tried bg="white", background color="white" and a number of other
attempts. 

The text is getting placed on the chart where I want it. 

Thanks, 
-Henry

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