Add a small note on unit testing of ycbcr.cpp.

diff --git a/ycbcr.cpp b/ycbcr.cpp
index f0124eaab178048a2ae3a00c758355fa275668a2..08c8cd25d4603c43b092abe078b6d98815a466e9 100644 (file)
--- a/ycbcr.cpp
+++ b/ycbcr.cpp
@@ -1,3 +1,6 @@
+// Note: This file does not have its own unit test; it is tested mainly
+// through YCbCrInput's unit tests.
+
 #include <Eigen/Core>
 #include <Eigen/LU>