[css-color-4] a bit more on 2020

svgeesus · svgeesus · commit 805603169b17 · 2020-09-24T15:41:02.000+03:00
diff --git a/css-color-4/Overview.bs b/css-color-4/Overview.bs
@@ -2661,6 +2661,10 @@ Predefined colorspaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'',
 			representing the red, green, and blue channels of the color,
 			with each having a valid range of [0, 1]. ITU Reference 2020 is used for High Definition, 4k and 8k television.
 
+			The primaries are physically realizable,
+			but with difficulty
+			as they lie very close to the spectral locus.
+
 			Current displays are unable to reproduce the full gamut of rec2020. Coverage is expected to increase over time as displays improve.
 
 			It has the following characteristics:
