diff --git a/tech/YUV.wiki b/tech/YUV.wiki
index 4b1f692..2feabcb 100644
--- a/tech/YUV.wiki
+++ b/tech/YUV.wiki
@@ -1,4 +1,12 @@
 = YUV =
 
 The YUV colorspace is a system to represent color in a more compact way that
-accounts for the way human perception works.
+accounts for the way human perception works. YUV is used in the PAL composite
+color video standard.
+
+The 'Y' pertains to the luma component, or how bright the color is. The
+two chrominance components called U (blue) and V (red). 
+
+Luminance is Y and luma is Y', where the prime sybmol denotes gamma correction.
+Luminance is physical linear space brigtness, while luma is precieved
+brightness (non linear).