diff --git a/README.md b/README.md
index 26464a0..3385e5d 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,13 @@ Base/Red rgb(249, 39, 7)
 TransparentRed rgba(255, 0, 0, 128)
 Base/Yellow #ff0
 ```
+Grayscale colors can be produced with the `white(value)` and `white(value, alpha)` syntax. A value of zero means black while a value of 255 is pure white. 
+
+```
+Black white(0)
+MediumGray white(128)
+TransparentGray white(128, 128)
+```
 
 Colors can also reference other colors by prefixing them with an `@` sign: