diff --git a/scribblings/roos.scrbl b/scribblings/roos.scrbl
index 52ce640..a789c4e 100644
--- a/scribblings/roos.scrbl
+++ b/scribblings/roos.scrbl
@@ -216,7 +216,7 @@ Below is an example SQLite backend implementation that stores fields in a table:
 This example builds an address book with persistent reference to persons, using ROOS' object ID mechanism.
 
 @#reader scribble/comment-reader 
-@racketblock[
+[racketblock
 (require racket/vector)
 
 ;; person class
@@ -256,7 +256,6 @@ This example builds an address book with persistent reference to persons, using
               (set! persons (list->vector ps)))))
   )
    
-   
 ;; Create sample data
 (define b (-! book))