diff --git a/README.md b/README.md
index a7d3be9..b37646e 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ char[] alphabet = {'a','b','c'};
 // Make IDs 10 characters long
 int size = 10;
 
-String id = NanoIdUtils.randomNanoId(random, alphabet, 10); // "babbcaabcb"
+String id = NanoIdUtils.randomNanoId(random, alphabet, size); // "babbcaabcb"
 ```
 
 ## Copyright and license