document DEFINE key in return value

diff --git a/lib/Imager/Probe.pm b/lib/Imager/Probe.pm
index c000f62f6e22070cee0966d1ad89cbb3e40b906a..dd8e8f65e09adf286532f964d3da62d53c12c569 100644 (file)
--- a/lib/Imager/Probe.pm
+++ b/lib/Imager/Probe.pm
@@ -401,6 +401,10 @@ C<INC> - C<-I> and other C options
 
 C<LIBS> - C<-L>, C<-l> and other link-time options
 
+=item *
+
+C<DEFINE> - C<-D> options, if any.
+
 =back
 
 The possible values for the hash supplied to the probe() method are: