diff --git a/README.md b/README.md
index 9ac9dcc..24d694f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,28 @@
 # esphome-things
 
+## Flash
+
+```
+JP1
+(○) GPIO0 ➙ GND (Bootloader mode)
+[○] TX    ➙ Programmer's RX
+[○] RX    ➙ Programmer's TX
+[○] VCC   ➙ +3.3V
+[○] GND   ➙ 0V (GND)
+```
+
+## Schematics
+
+```
+━━━┓
+   ┣━ I2C bus (GPIO21/GPIO22) ━ SHTC3 
+ E ┣━ Top left key (GPIO38) & deep sleep wake up
+ S ┣━ Top right key (GPIO39)
+ P ┣━ Bottom left key (GPIO37)
+   ┣━ Bottom right key (GPIO36)
+ 3 ┣━ Red LED (GPIO4)
+ 2 ┣━ Green LED (GPIO18)
+   ┣━ White LED (GPIO23)
+━━━┛
+
+```
\ No newline at end of file