diff --git a/README.md b/README.md
index 2688c76..0978c8f 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ If that function is defined, you can do things like that:
 ```clojure
 (println*
   &(using (Result.unsafe-from-success (File.open "example")) f
-    &(File.read-all &f)))
+    (the (Result String String) (File.read-all &f))))
 ```
 
 The file that was opened will be automatically closed once the scope is exited.
diff --git a/examples/file.carp b/examples/file.carp
index b1c1ae2..847ddde 100644
--- a/examples/file.carp
+++ b/examples/file.carp
@@ -1,11 +1,11 @@
 (load "main.carp")
-(load "git@github.com:carpentry-org/file.git@master")
+(load "git@github.com:carpentry-org/file.git@0.3.0")
 
 (implements close File.close)
 
 (defn main []
   (println*
-    &(using-do (Result.unsafe-from-success (File.open "example")) f
+    &(using-do (Result.unsafe-from-success (File.open-with "example" "w+")) f
       (ignore (File.write &f "hi"))
       (File.rewind &f)
-      (File.read &f 2))))
+      (the (Result String String) (File.read &f 2)))))