diff --git a/docs/use/actuators.md b/docs/use/actuators.md
index 4c081cc..8ec91c5 100644
--- a/docs/use/actuators.md
+++ b/docs/use/actuators.md
@@ -19,6 +19,20 @@ OFF command:
 ON command:
 `mosquitto_pub -t home/OpenMQTTGateway_MEGA/commands/MQTTtoONOFF -m '{"gpio":15,"cmd":1}'`
 
+Since v0.9.9, you could ask for a short activation, the PIN will change state for only half a second.
+
+For example you could use it with a relay board to activate an existing step relay. So your home automation act as a supplementary switch and do not interfere with the existing switch in your house.
+
+It's available only with [json receiving](../upload/pio.md#api):
+
+Goes ON for half a second, then back to OFF:
+`mosquitto_pub -t home/OpenMQTTGateway_MEGA/commands/MQTTtoONOFF -m '{"gpio":15,"cmd":"high_pulse"}'`
+
+Goes OFF for half a second, then back to ON:
+`mosquitto_pub -t home/OpenMQTTGateway_MEGA/commands/MQTTtoONOFF -m '{"gpio":15,"cmd":"low_pulse}"'`
+
+Be aware that outputs are OFF by default when the board first start.
+
 ## FASTLED
 ### The FASTLED module support 2 different operation modes
 1. control one specific RGB LED
diff --git a/main/ZactuatorONOFF.ino b/main/ZactuatorONOFF.ino
index b4c32ea..4f87efe 100644
--- a/main/ZactuatorONOFF.ino
+++ b/main/ZactuatorONOFF.ino
@@ -44,7 +44,23 @@ void MQTTtoONOFF(char* topicOri, JsonObject& ONOFFdata) {
       // we acknowledge the sending by publishing the value to an acknowledgement topic
       pub(subjectGTWONOFFtoMQTT, ONOFFdata);
     } else {
-      Log.error(F("MQTTtoONOFF failed json read" CR));
+      if (ONOFFdata["cmd"] == "high_pulse") {
+        Log.notice(F("MQTTtoONOFF high_pulse ok" CR));
+        Log.notice(F("GPIO number: %d" CR), gpio);
+        pinMode(gpio, OUTPUT);
+        digitalWrite(gpio, HIGH);
+        delay(500);
+        digitalWrite(gpio, LOW);
+      } else if (ONOFFdata["cmd"] == "low_pulse") {
+        Log.notice(F("MQTTtoONOFF low_pulse ok" CR));
+        Log.notice(F("GPIO number: %d" CR), gpio);
+        pinMode(gpio, OUTPUT);
+        digitalWrite(gpio, LOW);
+        delay(500);
+        digitalWrite(gpio, HIGH);
+      } else {
+        Log.error(F("MQTTtoONOFF failed json read" CR));
+      }
     }
   }
 }
diff --git a/main/config_ONOFF.h b/main/config_ONOFF.h
index 8fa22ef..0fcb3c2 100644
--- a/main/config_ONOFF.h
+++ b/main/config_ONOFF.h
@@ -37,7 +37,7 @@ extern void MQTTtoONOFF(char* topicOri, JsonObject& RFdata);
 #define ONKey  "setON"
 #define OFFKey "setOFF"
 #ifndef ACTUATOR_ON
-#  define ACTUATOR_ON LOW // 0 or 1, set to the output level of the gpio pin to turn the actuator on.
+#  define ACTUATOR_ON LOW // LOW or HIGH, set to the output level of the gpio pin to turn the actuator on.
 #endif
 #ifndef ACTUATOR_ONOFF_DEFAULT
 #  define ACTUATOR_ONOFF_DEFAULT !ACTUATOR_ON // ACTUATOR_ON or !ACTUATOR_ON, set to the state desired on reset.