X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrdgraph_data.pod;h=04d976174b4a679cf0eac31a2589d99f6d3e3e6e;hb=cffc3b561fbc7bafbde87b10edf18013df3da531;hp=dba53f3720a4a302b2cc8651545eed3a993bbd89;hpb=9b8a8e557d4c271ad4efe95c4b7bb7f0803e729c;p=rrdtool.git

diff --git a/doc/rrdgraph_data.pod b/doc/rrdgraph_data.pod
index dba53f3..04d9761 100644
--- a/doc/rrdgraph_data.pod
+++ b/doc/rrdgraph_data.pod
@@ -20,7 +20,7 @@ instructions use a language called B<RPN> which is described in its
 own manual page.
 
 Variable names (I<vname>) must be made up strings of the following characters
-C<A-Z, a-z, 0-9, -,_>, starting with a letter and a maximum length of 255 characters.
+C<A-Z, a-z, 0-9, -,_> and a maximum length of 255 characters.
 
 =head1 DEF
 
@@ -71,6 +71,9 @@ elements.
 
 Example: C<VDEF:avg=mydata,AVERAGE>
 
+Note that currently only agregation functions work in VDEF rpn expressions.
+Patches to change this are welcome.
+
 =head1 CDEF
 
 B<CDEF>:I<vname>=I<RPN expression>