diff --git a/things.ino b/things.ino
index 23d88d1..69aa5b1 100644
--- a/things.ino
+++ b/things.ino
@@ -19,6 +19,8 @@ extern "C" {
 //#define DHTTYPE DHT21 // DHT21 (AM2301)
 #define DHTTYPE DHT22   // DHT22 (AM2302)
 
+#define CONFIGPIN D3    // config-button is connected to this pin
+
 // define default values here, overwritten by values from config.json
 char mqtt_server[40];
 char mqtt_port[6] = "1883";
@@ -183,10 +185,11 @@ void setup() {
   // put your setup code here, to run once:
   Serial.begin(9600);
 
-  // set led pin as output
-  pinMode(BUILTIN_LED, OUTPUT);
+  pinMode(BUILTIN_LED, OUTPUT);   // set led pin as output
   ticker.attach(0.5, toggle_led); // toggle led slowly during initialization
 
+  pinMode(CONFIGPIN, INPUT);             // flash-button on nodemcu
+
   // clean FS, for testing
   //SPIFFS.format();
 
@@ -230,8 +233,12 @@ void setup() {
 
   // local intialization
   WiFiManager wifiManager;
-  // reset settings - for testing
-  //wifiManager.resetSettings();
+
+  // reset settings if config-button is pressed
+  if (!digitalRead(CONFIGPIN)) {
+    Serial.println("config-button pressed, resetting wifi settings");
+    wifiManager.resetSettings();
+  }
 
   // set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
   wifiManager.setAPCallback(configModeCallback);