Fix tutorial
diff --git a/client/content/playgrounds/fortune.md b/client/content/playgrounds/fortune.md
index 302bd85..1b13cd1 100644
--- a/client/content/playgrounds/fortune.md
+++ b/client/content/playgrounds/fortune.md
@@ -24,7 +24,7 @@
 
     type Fortune interface {
       // Returns a random fortune.
-      Get() (Fortune string, Err error)
+      Get() (Fortune string | error)
 
       // Adds a fortune to the set used by Get().
       Add(Fortune string) error