diff --git a/Large-app-how-to.md b/Large-app-how-to.md
index 7d37bc3..9d240ac 100644
--- a/Large-app-how-to.md
+++ b/Large-app-how-to.md
@@ -74,7 +74,7 @@ We'll create 4 modules, an user module (manage user's registration, login, lost
     app.run(debug=True)
 ```
 
-`/shell.py` will allow you to get a console and enter commands within your flask environment. Maybe not as nice as debugging with pdb, but always usefull (when you will initialize your database).
+`/shell.py` will allow you to get a console and enter commands within your flask environment. Maybe not as nice as debugging with pdb, but always useful (when you will initialize your database).
 
 ```python
     #!/usr/bin/env python