diff --git a/README.md b/README.md
index ea388bf..99942d8 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ This library supports the parsing and verification as well as the generation and
 Parsing and verifying tokens is pretty straight forward.  You pass in the token and a function for looking up the key.  This is done as a callback since you may need to parse the token to find out what signing method and key was used.
 
 ```go
-	token, err := jwt.Parse(myToken, func(token *jwt.Token) ([]byte, error) {
+	token, err := jwt.Parse(myToken, func(token *jwt.Token) (interface{}, error) {
 		return myLookupKey(token.Header["kid"])
 	})