vnames MUST start with a letter

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@618 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/doc/rrdgraph_data.pod b/doc/rrdgraph_data.pod
index c57b2c3..dba53f3 100644 (file)
--- 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, -,_> with a maximum length of 255 characters.
+C<A-Z, a-z, 0-9, -,_>, starting with a letter and a maximum length of 255 characters.
 
 =head1 DEF