diff --git a/README.md b/README.md
index ccab28f..80af51e 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,6 @@ FCL is the programming language of an Android app called Forth Calculator. It is
 ```forth
 : fib ( n1 n2 -- n1 n2 n3 ) 2dup + ;
 
-: nfib ( n -- .. ) -> n 
-  0 1 n { fib } times ;
+: nfib ( n -- .. ) -> n ( local var n )
+  0 1 n { fib } times ; ( quotation )
 ```