diff --git a/esp32/Readme.md b/esp32/Readme.md
index 15704a8..ae1a50d 100644
--- a/esp32/Readme.md
+++ b/esp32/Readme.md
@@ -18,6 +18,7 @@ Uses ESP32MiniKit
   * Solar powered (voltage)
   * Lipo-Powered (voltage)
   * Temperature
+  * Distance sensor [JSN-SR04T-2.0] (for waterlevel)
  * Custom GPIO
 
 ## Documentation of Power-Modes
diff --git a/esp32/src/main.cpp b/esp32/src/main.cpp
index fb89d27..86757e4 100644
--- a/esp32/src/main.cpp
+++ b/esp32/src/main.cpp
@@ -404,7 +404,10 @@ long getLastActivationForPump(int plantId)
   }
 }
 
-/* Use the Ultrasonic sensor to measure waterLevel */
+/**
+ * @brief Read ultra sensor JSN-SR04T-2.0
+ * Read the distance of the water level.
+ */
 void readDistance()
 {
   for (int i = 0; i < 5; i++)