diff --git a/README.md b/README.md
index 946c07a..0e11d41 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,22 @@ LCD is HD44780, 2-line.
 ## Pinout
 
 - D2 - RS
-- D3 - RW
+- D3 - R/W
 - D4 - E
 - D5..D8 - DATA4..7
 - D9 - 1-Wire data, 4k7 pullup to 5V
 
+## HD44780 connection
+
+- GND
+- +5
+- contrast (potentiometer +5 - GND)
+- RS
+- R/W
+- E
+- D0-D3 ... to GND
+- D4-D7 ... communication
+
 ## Usage
 
 Everything is automatic, just connect 1-Wire devices to the data pin.