diff --git a/readme.md b/readme.md
index a8d4567..771af3d 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 ![](./docs/IMG_4936.jpg)
 
-Update Amplifier:
+Update Amplifier (separate input circuitry per PSG, it appears, that a silent PSG has a DC level on its output which is summarized to the AC output of the working PSG, so two input circuits with individual couping capacitor):
 
 ![](./docs/IMG_4941.jpg)