diff --git a/src/class/hid/hid.h b/src/class/hid/hid.h
index 782a1a552..b4e8a9c4c 100644
--- a/src/class/hid/hid.h
+++ b/src/class/hid/hid.h
@@ -222,6 +222,7 @@ typedef enum
   GAMEPAD_BUTTON_MODE   = TU_BIT(12), ///< Mode button
   GAMEPAD_BUTTON_THUMBL = TU_BIT(13), ///< L3 button
   GAMEPAD_BUTTON_THUMBR = TU_BIT(14), ///< R3 button
+  // Note: Button number start from 1 on host OS
   GAMEPAD_BUTTON_16     = TU_BIT(15), ///< Button 16
   GAMEPAD_BUTTON_17     = TU_BIT(16), ///< Button 17
   GAMEPAD_BUTTON_18     = TU_BIT(17), ///< Button 18
diff --git a/src/class/hid/hid_device.c b/src/class/hid/hid_device.c
index 151a36225..e44f282c4 100644
--- a/src/class/hid/hid_device.c
+++ b/src/class/hid/hid_device.c
@@ -149,7 +149,7 @@ bool tud_hid_n_mouse_report(uint8_t instance, uint8_t report_id,
 }
 
 bool tud_hid_n_gamepad_report(uint8_t instance, uint8_t report_id,
-                              int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint16_t buttons)
+                              int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint32_t buttons)
 {
   hid_gamepad_report_t report =
   {
diff --git a/src/class/hid/hid_device.h b/src/class/hid/hid_device.h
index 1d1213e3f..19e9315f4 100644
--- a/src/class/hid/hid_device.h
+++ b/src/class/hid/hid_device.h
@@ -72,9 +72,9 @@ bool tud_hid_n_keyboard_report(uint8_t instance, uint8_t report_id, uint8_t modi
 // use template layout report as defined by hid_mouse_report_t
 bool tud_hid_n_mouse_report(uint8_t instance, uint8_t report_id, uint8_t buttons, int8_t x, int8_t y, int8_t vertical, int8_t horizontal);
 
-// Gamepad: convenient helper to send mouse report if application
+// Gamepad: convenient helper to send gamepad report if application
 // use template layout report TUD_HID_REPORT_DESC_GAMEPAD
-bool tud_hid_n_gamepad_report(uint8_t instance, uint8_t report_id, int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint16_t buttons);
+bool tud_hid_n_gamepad_report(uint8_t instance, uint8_t report_id, int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint32_t buttons);
 
 //--------------------------------------------------------------------+
 // Application API (Single Port)
@@ -85,7 +85,7 @@ static inline uint8_t tud_hid_get_protocol(void);
 static inline bool    tud_hid_report(uint8_t report_id, void const* report, uint8_t len);
 static inline bool    tud_hid_keyboard_report(uint8_t report_id, uint8_t modifier, uint8_t keycode[6]);
 static inline bool    tud_hid_mouse_report(uint8_t report_id, uint8_t buttons, int8_t x, int8_t y, int8_t vertical, int8_t horizontal);
-static inline bool    tud_hid_gamepad_report(uint8_t report_id, int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint16_t buttons);
+static inline bool    tud_hid_gamepad_report(uint8_t report_id, int8_t x, int8_t y, int8_t z, int8_t rz, int8_t rx, int8_t ry, uint8_t hat, uint32_t buttons);
 
 //--------------------------------------------------------------------+
 // Callbacks (Weak is optional)