diff --git a/ensaht.c b/ensaht.c
index 56ee70a..93cc3ad 100644
--- a/ensaht.c
+++ b/ensaht.c
@@ -1,8 +1,26 @@
+/******************************************************************************
+ *                       _     _
+ *   ___ _ __  ___  __ _| |__ | |_
+ *  / _ \ '_ \/ __|/ _` | '_ \| __|
+ * |  __/ | | \__ \ (_| | | | | |_
+ *  \___|_| |_|___/\__,_|_| |_|\__|
+ *
+ * Program Name: ensaht
+ * Author:       A.M Rowsell <amr@frzn.dev>
+ * License:      MIT License (Free use, modification, and distribution permitted
+ *               as long as the original copyright notice is included. Provided
+ *               "AS IS" without warranty).
+ *
+ * Description:  Reads environmental data (temperature, humidity, AQI, TVOC,
+ *               eCO2, EtOH) via I2C from AHT and ENS sensors and publishes
+ *               the readings to Adafruit IO over MQTT using the Pico W.
+ ******************************************************************************/
+
 #include "hardware/gpio.h"
 #include "hardware/i2c.h"
 #include "mqtt.h"
 #include "pico/cyw43_arch.h"
-#include "pico/stdlib.h"
+#include "pico/stdlib.h" // IWYU pragma: keep
 #include <boards/pico_w.h>
 #include <hardware/structs/io_bank0.h>
 #include <pico/binary_info/code.h>