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-rw-r--r--core/fxcrt/fx_coordinates.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/core/fxcrt/fx_coordinates.h b/core/fxcrt/fx_coordinates.h
index cbae45b76f..fc51c458a0 100644
--- a/core/fxcrt/fx_coordinates.h
+++ b/core/fxcrt/fx_coordinates.h
@@ -570,6 +570,7 @@ class CFX_FloatRect {
// | a b 0 |
// | c d 0 |
// | e f 1 |
+// See PDF spec 1.7 Section 4.2.3.
//
class CFX_Matrix {
public: