diff --git a/doc/rrdgraph_rpn.pod b/doc/rrdgraph_rpn.pod
index 5558c224b70c8e15bb3455911ebeb77158695abe..894fef16bbabcf42215946a1f880d8241d954f38 100644 (file)
--- a/doc/rrdgraph_rpn.pod
+++ b/doc/rrdgraph_rpn.pod
=item LAST, FIRST
-Return the last/first value including its time. The time for
-FIRST is actually the start of the corresponding interval, whereas
-LAST returns the end of the corresponding interval.
+Return the last/first non-nan or infinite value for the selected data
+stream, including its timestamp.
Example: C<VDEF:first=mydata,FIRST>