diff --git a/README.md b/README.md
index 7cc2e2a..6fd2ce6 100644
--- a/README.md
+++ b/README.md
@@ -14,10 +14,16 @@ Open a terminal window on Raspberry Pi and type:
 
 This will download (clone) the software to your local Raspberry Pi.
 
-Type <code>cd craftbeerpi</code> to navigate into the craftbeerpi folder.
+Type <code>cd craftbeerpi3</code> to navigate into the craftbeerpi folder.
 
 Type <code>sudo ./install.sh</code>
 
 ## ATTENTION
 
 CraftBeerPi 3.0 is a complete rewrite. Server as well as user interface. I recommend to use a second SD card for testing.
+
+## Donation
+
+CraftBeerPi is a free & open source project. If you like to support the project I happy about a donation:
+
+[![Donate](https://www.paypal.com/en_US/i/btn/btn_donateCC_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=2X9KR98KJ8YZQ)
diff --git a/modules/core/controller.py b/modules/core/controller.py
index 464438f..c744520 100644
--- a/modules/core/controller.py
+++ b/modules/core/controller.py
@@ -118,7 +118,7 @@ class FermenterController(ControllerBase, ActorController, SensorController):
     def heater_on(self, power=100):
         f = self.api.cache.get("fermenter").get(self.fermenter_id)
         if f.heater is not None:
-            self.actor_on(power, int(f.heater))
+            self.actor_on(int(f.heater))
 
     @cbpi.try_catch(None)
     def heater_off(self):