diff --git a/functions.styl b/functions.styl
index 320e3f6..a4aad25 100644
--- a/functions.styl
+++ b/functions.styl
@@ -1,5 +1,6 @@
 /**
  * Return percentage of given target/context ratio for responsive bliss
+ * E.g. width: ratio(1, 3) => width: 33.333333%
  */
 ratio(target, context)
   value = (target / context * 100)%