added doc for new slope-mode

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@491 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index b87d9d7d8a58ced806103c077858415c6991ef11..a0a54228557df7398d3546a7c81b286c11fbb6c1 100644 (file)
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -291,6 +291,12 @@ This specifies the largest font size which will be rendered
 bitmapped, that is, without any font smoothing. By default,
 no text is rendered bitmapped.
 
+[B<-E>|B<--slope-mode>]
+
+RRDtool graphs are composed of stair case curves by default. This is in line with
+the way RRDtool calculates its data. Some people favor a more 'organic' look
+for their graphs even though it is not all that true.
+
 [B<-a>|B<--imgformat> B<PNG>|B<SVG>|B<EPS>|B<PDF>]
 
 Image format for the generated graph. For the vector formats you can