diff --git a/drone_sniffer/README.md b/drone_sniffer/README.md
index 67f14c6..ef91beb 100644
--- a/drone_sniffer/README.md
+++ b/drone_sniffer/README.md
@@ -3,3 +3,19 @@
 Firmware for an ESP32.
 Listen to beacon wifi frames to detect drones that broadcast their position according to the french regulation.
 
+
+## How to use
+
+Clone the [esp-idf](https://github.com/espressif/esp-idf) repository on your PC, and set the `IDF_PATH` environnement variable.
+
+Then as usual :
+
+`mkdir build && cd build`
+
+`cmake ..`
+
+`make`
+
+Connect the ESP32 to your PC
+
+`make flash`