fix description of SRGB_MIXED

diff --git a/README.txt b/README.txt
index 9617d7f..bd61bb0 100644 (file)
--- a/README.txt
+++ b/README.txt
@@ -4,7 +4,7 @@ Color distance function: S2TC_COLORDIST_MODE (default: WAVG)
 RGB:           weighted YCbCr difference assuming linear input
 YUV:           weighted Y'Cb'Cr' difference assuming sRGB input
 SRGB:          weighted YCbCr difference assuming sRGB input
-SRGB_MIXED:    weighted "Y'CbCr" difference assuming sRGB input
+SRGB_MIXED:    weighted "Y'(Y)Cb'Cr'" difference assuming sRGB input
 LAB:           L*a*b* difference
 AVG:           standard average (generic)
 WAVG:          weighted RGB average