diff --git a/rails-models.md b/rails-models.md
index 3f058b018..f074eb38e 100644
--- a/rails-models.md
+++ b/rails-models.md
@@ -98,7 +98,7 @@ Or HABTM:
 
 And in migrations:
 
-    create_table :images do
+    create_table :images do |t|
       t.references :post, :polymorphic => true
     end