fix spelling

diff --git a/doc/rrdgraph_data.pod b/doc/rrdgraph_data.pod
index 4d5642c70851752a12bf4fdefbe47cf5ac919ef9..65beab3dff58f2e759c29a8ef6ebb57b6f5b505a 100644 (file)
--- a/doc/rrdgraph_data.pod
+++ b/doc/rrdgraph_data.pod
@@ -23,7 +23,7 @@ Variable names (I<vname>) must be made up strings of the following characters
 C<A-Z, a-z, 0-9, _, -> and a maximum length of 255 characters.
 
 When picking variable names, make sure you do not choose a name that is
-already taken by an RPN operator. A safe bet it to use lowercase or
+already taken by an RPN operator. A safe bet is to use lowercase or
 mixed case names for variables since operators will always be in uppercase.
 
 =head1 DEF