Update README.md

Author: NikolaiRadke

schematics/README.md

@@ -1,9 +1,10 @@
 # Schematics
 
 ### Technical schematics
-* **NOKOlino.png**:
+* **NOKOlino.png**:  
 NOKOlino's main schematic. It was written with [gEDA](http://www.geda-project.org/).  
-You can find the source files in folder [geda/](https://github.com/NikolaiRadke/NOKOlino/tree/master/schematics/geda).
+* **NOKOlino_phototransistor.png**:  
+Optional light sensor extension schematic.  
 
 ### Other manuals