[librsvg] parse_transform.lalrpop: Point to the correct section of the spec

[Federico Mena Quintero <federico src gnome org>]

commit fa7548f03d375ac7697359eb8bfc41053a51b5e4
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Mar 22 08:09:14 2017 -0600

    parse_transform.lalrpop: Point to the correct section of the spec

 rust/src/parse_transform.lalrpop |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/rust/src/parse_transform.lalrpop b/rust/src/parse_transform.lalrpop
index db065b4..6f9e66a 100644
--- a/rust/src/parse_transform.lalrpop
+++ b/rust/src/parse_transform.lalrpop
@@ -1,4 +1,8 @@
 //-*- rust -*-
+//
+// This parser is for the "transform" attribute in SVG.
+// Its operataion and grammar are described here:
+// https://www.w3.org/TR/SVG/coords.html#TransformAttribute
 
 use std::str::FromStr;