[librsvg: 13/19] Link to the transform part of the spec

[Federico Mena Quintero <federico src gnome org>]

commit 1138d63b3a0eeeb9639182500cca72ba54ddef1f
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Jan 22 12:28:32 2018 -0600

    Link to the transform part of the spec

 rust/src/transform.rs | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/rust/src/transform.rs b/rust/src/transform.rs
index 3db0670..5b86d38 100644
--- a/rust/src/transform.rs
+++ b/rust/src/transform.rs
@@ -20,6 +20,10 @@ impl Parse for cairo::Matrix {
     }
 }
 
+// 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
+
 pub fn parse_transform(s: &str) -> Result<cairo::Matrix, AttributeError> {
     let matrix = parse_transform_list(s)?;