diff --git a/README.md b/README.md
index e6f3b34..b97ca2a 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,7 @@ const buffer = Buffer.from(
   'hex'
 );
 
-const buf = new BufWrapper();
+const buf = new BufWrapper(buffer);
 buf.readInt(); // 42
 buf.readString(); // 'Hello World'
 buf.readLong(); // 123456789