diff --git a/readme.md b/readme.md
index 41dccc2..ef0f001 100644
--- a/readme.md
+++ b/readme.md
@@ -5,7 +5,7 @@
 
 ![The device](./docs/IMG_3853.jpg)
 
-![RS485/Modbus signals on the osciloscope](./docs/modbus01.png)
+![Modbus signals in front of RS485 transceiver on the osciloscope](./docs/modbus01.png)
 
 ![Notes on schematics](./docs/IMG_3855.jpg)