X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrdgraph_rpn.pod;h=aabd7383e43979ae6396d0fc210aa3c879a55563;hb=1beb3e2b77321278732f12c63497ba9bc05fb79a;hp=3718349cdbba42e80e991fb461511675cf18b48c;hpb=c6bbce5f7558012214b35a712b4953f1121f849d;p=rrdtool.git

diff --git a/doc/rrdgraph_rpn.pod b/doc/rrdgraph_rpn.pod
index 3718349..aabd738 100644
--- a/doc/rrdgraph_rpn.pod
+++ b/doc/rrdgraph_rpn.pod
@@ -99,6 +99,11 @@ B<+, -, *, /, %>
 
 Add, subtract, multiply, divide, modulo
 
+B<ADDNAN>
+
+NAN-safe addition. If one parameter is NAN/UNKNOWN it'll be treated as
+zero. If both parameters are NAN/UNKNOWN, NAN/UNKNOWN will be returned.
+
 B<SIN, COS, LOG, EXP, SQRT>
 
 Sine and cosine (input in radians), log and exp (natural logarithm),