diff --git a/ampel-firmware/led_effects.cpp b/ampel-firmware/led_effects.cpp
index 1410a1475ec6dbae0ef5912373555837636dedd9..af463f69d0359b748e7b9702670b5d0d5fae6fff 100644
--- a/ampel-firmware/led_effects.cpp
+++ b/ampel-firmware/led_effects.cpp
@@ -146,6 +146,7 @@ namespace led_effects {
     static uint16_t wheel_offset = 0;
     unsigned long t0 = millis();
     pixels.setBrightness(config::max_brightness);
+    //FIXME: OVERFLOW!
     while (millis() < t0 + duration_ms) {
       for (int i = 0; i < NUMPIXELS; i++) {
         pixels.setPixelColor(i, pixels.ColorHSV(i * 65535 / NUMPIXELS + wheel_offset));
diff --git a/ampel-firmware/lorawan.cpp b/ampel-firmware/lorawan.cpp
index 75363a0337ce887c860d38fb7c5a940bed3e642f..e9f805848a6a8c65b9ff3f8c2e3e11e0225dd2b3 100644
--- a/ampel-firmware/lorawan.cpp
+++ b/ampel-firmware/lorawan.cpp
@@ -184,6 +184,7 @@ namespace lorawan {
   void preparePayloadIfTimeHasCome(const int16_t &co2, const float &temperature, const float &humidity) {
     static unsigned long last_sent_at = 0;
     unsigned long now = seconds();
+    //FIXME: OVERFLOW!
     if (connected && (now > last_sent_at + config::lorawan_sending_interval)) {
       last_sent_at = now;
       preparePayload(co2, temperature, humidity);