diff --git a/KLayout-Python-Module-Prototype.md b/KLayout-Python-Module-Prototype.md
index 93769ed..5da57db 100644
--- a/KLayout-Python-Module-Prototype.md
+++ b/KLayout-Python-Module-Prototype.md
@@ -33,6 +33,7 @@ export PYTHONPATH=<your-installation-path>/pymod
 python
 >>> import klayout.db as db
 >>> print(str(db.DBox(0, 0, 100, 200))
+(0,0;100,200)
 ```
 
 ## Using the module