docs/2016-11-02-geometry.md

@@ -73,7 +73,7 @@ Here a sample:
 ```
 
 - `id` mandatory parameter, also referred by crossings and transitions.  	
-- `class` optional parameter defining the type of the subroom. At the moment two classes are defined:
+- `class` optional parameter defining the type of the subroom. At the moment three classes are defined:
   - `floor`
   - `stairs` take additionally
     `<up px="-5.0" py="2" />` and 	`<down px="0.0" py="2"/>`, which are