diff --git a/README.md b/README.md
index a844c4b..d2f8bc1 100644
--- a/README.md
+++ b/README.md
@@ -285,8 +285,8 @@ You can build your own "tube-in-tube" heat exchangers. It's not hard. Cheaper. T
 <img src="./m_tube-in-tube_diy1.jpg" width="400"> <img src="./m_tube-in-tube_diy2.jpg" width="400"><br><br>
 Additionally, you can think "I'll take an old AC parts... Housing... Slightly change... An hour or two, day of work maximum and I'll get a refrigerant<->water heat exchanger in for a penny!". This idea is obvious. It was the first thing I've tried. You can try this, but to achieve "not very bad" performance it'll take more than a one day and much more than a few $$, even if you have unlimited access to older ACs.<br>
 Ok, I think that's enough for this appendix, this is a controller page, and not how-to-build-refrigeration-systems page.<br>
-{-Overall, your system with sensors positions will look like at drawing below. Refrigerators (heat pumps) are very simple devices. -}
-<img src="./m_HeatPump_scheme2.png" width="500"><br><br>
+Overall, your system with sensor locations will look like at a scheme below. Refrigerators (heat pumps) are simple devices. If you do not need to control over all temperatures, disable and do not use (install) unnecessary sensors.<br>
+<img src="./m_Valden_Heat_Pump_Controller_model.jpg" width="1000"><br><br>
 
 ## Appendix D: Firmware options and fine-tuning