diff --git a/drivers/wireless/gs2200m.c b/drivers/wireless/gs2200m.c
index bea69b6385..7c89ea21f3 100644
--- a/drivers/wireless/gs2200m.c
+++ b/drivers/wireless/gs2200m.c
@@ -33,6 +33,14 @@
  *
  ****************************************************************************/
 
+/****************************************************************************
+ * gs2200m driver.
+ *
+ * See "GS2200MS2W Adapter Command Reference Guide" for the explanation
+ * of AT commands. You can find the document at:
+ * https://www.telit.com/m2m-iot-products/wifi-bluetooth-modules/wi-fi-gs2200m/
+ ****************************************************************************/
+
 /****************************************************************************
  * Included Files
  ****************************************************************************/