diff --git a/README.md b/README.md
index c79c04c..0601cd4 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ var variables = require('variables')
 
 Do CSS variables magic.
 
-### map = variables.parse([map])
+### map = variables.parse(css)
 
 Parse CSS variables on `:root`,
 storing the variable values in `map`.