diff --git a/README.md b/README.md
index 0f7153e..e0005e7 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ Features:
 
 CAD files (OpenSCAD) and source code included.
 
+
 ![Weatherstation](cad/img/weatherstation.jpg)
 
 | geiger counter and DHT22              | particle sensor and ESP8266             |
@@ -71,6 +72,10 @@ RadiationD-v1.1(CAJOE):
  - 5V  -> 5V
  - VIN -> D6
 
+## ToDo
+* https://hackaday.com/2014/10/25/use-a-cheap-pin-diode-as-a-geiger-counter/ (opengeiger.de/elektronik.html)
+* Solar power
+
 ## License
 
 ### Code