--- a/qjpeg/plugins/LumScaler.cpp	Sun Dec 09 19:03:09 2007 +0100
+++ b/qjpeg/plugins/LumScaler.cpp	Sun Dec 09 23:47:31 2007 +0100
@@ -17,6 +17,16 @@
 #include <cmath>
 #include "LumScaler.h"
 
+/* Implementation of the method developed by Hiroshi Sugita and Akira Taguchi:
+ *   Chrominance Signal Interpolation of YUV 4:2:0 Format Color Images
+ * from the
+ * Electronics and Communications in Japan, Part 3, Vol. 89, No. 9, 2006
+ *
+ * Notes:
+ * - We adapted the algorithm to JPEG's 4:2:2 and 4:2:0, according to the
+ *   intersited color planes (instead of the article's cosited planes)
+ */
+
 static void
 int_upsample_row(const FloatPlane &in, FloatPlane &out,
         const unsigned int inrow, const unsigned int outrow,