diff --git a/README.md b/README.md
index 8104a20..2c18105 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,5 @@ Go by Example book source.
 
 ```bash
 $ mate tool/index.txt
-$ go run tool/reorder.go
+$ go run tool/renumber.go
 ```