diff --git a/README.md b/README.md
index c916753cdb..f51aa46b5e 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ into objects which match the OpenAPI 3.0 definition. The code generator in this
 directory does a lot of that for you. You would run it like so:
 
     go install github.com/deepmap/oapi-codegen/cmd/oapi-codegen@latest
-    oapi-codegen petstore-expanded.yaml > petstore.gen.go
+    oapi-codegen -package petstore petstore-expanded.yaml > petstore.gen.go
 
 Let's go through that `petstore.gen.go` file to show you everything which was
 generated.