is it a typo?

"AndyL" == Liaw, Andy <andy_liaw@merck.com>
    on Tue, 14 Sep 2004 10:28:31 -0400 writes:

AndyL> In ?options:
    AndyL> 'warning.expression': an R code expression to be called if a
    AndyL> warning is generated, replacing the standard message.  If
    AndyL> non-null is called irrespective of the value of option
    AndyL> 'warn'.

    AndyL> Is there a missing `it' between `non-null' and `is'?

yes, thank you -- now fixed.

Martin