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diff --git a/TODO b/TODO
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--- a/TODO
+++ b/TODO
@@ -5,6 +5,7 @@ Colour models and colour spaces:
 	YCbCr
 	TSL
 	Y'UV
+	Y'IQ
 	Hunter 1948 color space (see Wikipedia article on CIELAB; see http://www.konicaminolta.com/instruments/knowledge/color/part4/06.html)
 	Hunter Rdab
 	CIELCh (CIEHLC) (see Wikipedia article on CIELAB)