diff --git a/README.md b/README.md
index a3bca478..d5e11732 100644
--- a/README.md
+++ b/README.md
@@ -294,7 +294,7 @@ You'll need to know the 2 letter state code ('NY' for New York) or the 3 letter
 
 This will draw a world map and fill in IRL (Ireland) with the corresponding `fills.LOW` and USA with `fills.MEDIUM`.
 
-You can also use `fill: color` for each state if you don't want to define a `fillKey`.
+You can also use `{key: color}` (eg, `{CA: 'green'}) for each state if you don't want to define a `fillKey`.
 
 Colors will be applied in this order: `fillKey`, `fill`, `defaultFill`.