diff --git a/libraries/AP_JSButton/AP_JSButton.cpp b/libraries/AP_JSButton/AP_JSButton.cpp
index c019c26ee2..1e38163350 100644
--- a/libraries/AP_JSButton/AP_JSButton.cpp
+++ b/libraries/AP_JSButton/AP_JSButton.cpp
@@ -5,14 +5,14 @@ const AP_Param::GroupInfo JSButton::var_info[] = {
     // @Param: FUNCTION
     // @DisplayName: Function for button
     // @Description: Set to 0 to disable or choose a function
-    // @Values: 0:Disabled,1:shift,2:arm_toggle,3:arm,4:disarm,5:mode_manual,6:mode_stabilize,7:mode_depth_hold,8:mode_poshold,9:mode_auto,10:mode_circle,11:mode_guided,12:mode_acro,21:mount_center,22:mount_tilt_up,23:mount_tilt_down,24:camera_trigger,25:camera_source_toggle,26:mount_pan_right,27:mount_pan_left,31:lights1_cycle,32:lights1_brighter,33:lights1_dimmer,34:lights2_cycle,35:lights2_brighter,36:lights2_dimmer,41:gain_toggle,42:gain_inc,43:gain_dec,44:trim_roll_inc,45:trim_roll_dec,46:trim_pitch_inc,47:trim_pitch_dec,48:input_hold_set,49:roll_pitch_toggle,51:relay_1_on,52:relay_1_off,53:relay_1_toggle,54:relay_2_on,55:relay_2_off,56:relay_2_toggle,57:relay_3_on,58:relay_3_off,59:relay_3_toggle,61:servo_1_inc,62:servo_1_dec,63:servo_1_min,64:servo_1_max,65:servo_1_center,66:servo_2_inc,67:servo_2_dec,68:servo_2_min,69:servo_2_max,70:servo_2_center,71:servo_3_inc,72:servo_3_dec,73:servo_3_min,74:servo_3_max,75:servo_3_center,91:custom_1,92:custom_2,93:custom_3,94:custom_4,95:custom_5,96:custom_6,101:relay_4_on,102:relay_4_off,103:relay_4_toggle
+    // @Values: 0:Disabled,1:shift,2:arm_toggle,3:arm,4:disarm,5:mode_manual,6:mode_stabilize,7:mode_depth_hold,8:mode_poshold,9:mode_auto,10:mode_circle,11:mode_guided,12:mode_acro,21:mount_center,22:mount_tilt_up,23:mount_tilt_down,24:camera_trigger,25:camera_source_toggle,26:mount_pan_right,27:mount_pan_left,31:lights1_cycle,32:lights1_brighter,33:lights1_dimmer,34:lights2_cycle,35:lights2_brighter,36:lights2_dimmer,41:gain_toggle,42:gain_inc,43:gain_dec,44:trim_roll_inc,45:trim_roll_dec,46:trim_pitch_inc,47:trim_pitch_dec,48:input_hold_set,49:roll_pitch_toggle,51:relay_1_on,52:relay_1_off,53:relay_1_toggle,54:relay_2_on,55:relay_2_off,56:relay_2_toggle,57:relay_3_on,58:relay_3_off,59:relay_3_toggle,61:servo_1_inc,62:servo_1_dec,63:servo_1_min,64:servo_1_max,65:servo_1_center,66:servo_2_inc,67:servo_2_dec,68:servo_2_min,69:servo_2_max,70:servo_2_center,71:servo_3_inc,72:servo_3_dec,73:servo_3_min,74:servo_3_max,75:servo_3_center,91:custom_1,92:custom_2,93:custom_3,94:custom_4,95:custom_5,96:custom_6,101:relay_4_on,102:relay_4_off,103:relay_4_toggle,104:relay_1_momentary,105:relay_2_momentary,106:relay_3_momentary,107:relay_4_momentary
     // @User: Standard
     AP_GROUPINFO("FUNCTION", 1, JSButton, _function, 0),
 
     // @Param: SFUNCTION
     // @DisplayName: Function for button when the shift mode is toggled on
     // @Description: Set to 0 to disable or choose a function
-    // @Values: 0:Disabled,1:shift,2:arm_toggle,3:arm,4:disarm,5:mode_manual,6:mode_stabilize,7:mode_depth_hold,8:mode_poshold,9:mode_auto,10:mode_circle,11:mode_guided,12:mode_acro,21:mount_center,22:mount_tilt_up,23:mount_tilt_down,24:camera_trigger,25:camera_source_toggle,26:mount_pan_right,27:mount_pan_left,31:lights1_cycle,32:lights1_brighter,33:lights1_dimmer,34:lights2_cycle,35:lights2_brighter,36:lights2_dimmer,41:gain_toggle,42:gain_inc,43:gain_dec,44:trim_roll_inc,45:trim_roll_dec,46:trim_pitch_inc,47:trim_pitch_dec,48:input_hold_set,49:roll_pitch_toggle,51:relay_1_on,52:relay_1_off,53:relay_1_toggle,54:relay_2_on,55:relay_2_off,56:relay_2_toggle,57:relay_3_on,58:relay_3_off,59:relay_3_toggle,61:servo_1_inc,62:servo_1_dec,63:servo_1_min,64:servo_1_max,65:servo_1_center,66:servo_2_inc,67:servo_2_dec,68:servo_2_min,69:servo_2_max,70:servo_2_center,71:servo_3_inc,72:servo_3_dec,73:servo_3_min,74:servo_3_max,75:servo_3_center,91:custom_1,92:custom_2,93:custom_3,94:custom_4,95:custom_5,96:custom_6,101:relay_4_on,102:relay_4_off,103:relay_4_toggle
+    // @Values: 0:Disabled,1:shift,2:arm_toggle,3:arm,4:disarm,5:mode_manual,6:mode_stabilize,7:mode_depth_hold,8:mode_poshold,9:mode_auto,10:mode_circle,11:mode_guided,12:mode_acro,21:mount_center,22:mount_tilt_up,23:mount_tilt_down,24:camera_trigger,25:camera_source_toggle,26:mount_pan_right,27:mount_pan_left,31:lights1_cycle,32:lights1_brighter,33:lights1_dimmer,34:lights2_cycle,35:lights2_brighter,36:lights2_dimmer,41:gain_toggle,42:gain_inc,43:gain_dec,44:trim_roll_inc,45:trim_roll_dec,46:trim_pitch_inc,47:trim_pitch_dec,48:input_hold_set,49:roll_pitch_toggle,51:relay_1_on,52:relay_1_off,53:relay_1_toggle,54:relay_2_on,55:relay_2_off,56:relay_2_toggle,57:relay_3_on,58:relay_3_off,59:relay_3_toggle,61:servo_1_inc,62:servo_1_dec,63:servo_1_min,64:servo_1_max,65:servo_1_center,66:servo_2_inc,67:servo_2_dec,68:servo_2_min,69:servo_2_max,70:servo_2_center,71:servo_3_inc,72:servo_3_dec,73:servo_3_min,74:servo_3_max,75:servo_3_center,91:custom_1,92:custom_2,93:custom_3,94:custom_4,95:custom_5,96:custom_6,101:relay_4_on,102:relay_4_off,103:relay_4_toggle,104:relay_1_momentary,105:relay_2_momentary,106:relay_3_momentary,107:relay_4_momentary
     // @User: Standard
     AP_GROUPINFO("SFUNCTION", 2, JSButton, _sfunction, 0),
 
diff --git a/libraries/AP_JSButton/AP_JSButton.h b/libraries/AP_JSButton/AP_JSButton.h
index bf0c379649..573695561d 100644
--- a/libraries/AP_JSButton/AP_JSButton.h
+++ b/libraries/AP_JSButton/AP_JSButton.h
@@ -91,7 +91,12 @@ public:
         k_relay_4_on            = 101,           ///< trigger relay on
         k_relay_4_off           = 102,           ///< trigger relay off
         k_relay_4_toggle        = 103,           ///< trigger relay toggle
-        // 104+ reserved for future functions
+
+        k_relay_1_momentary     = 104,           ///< relay toggle when button is pushed, and again when released
+        k_relay_2_momentary     = 105,
+        k_relay_3_momentary     = 106,
+        k_relay_4_momentary     = 107,
+        // 106+ reserved for future functions
         k_nr_btn_functions         ///< This must be the last enum value (only add new values _before_ this one)
     } button_function_t;