diff --git a/ampel-firmware/sensor_commands.cpp b/ampel-firmware/sensor_commands.cpp
index 3b4d56b82d8ae89b87218cd8951a6afc62323a05..48d59c03da1495f8b5a38eb090c781a35374ba06 100644
--- a/ampel-firmware/sensor_commands.cpp
+++ b/ampel-firmware/sensor_commands.cpp
@@ -77,7 +77,10 @@ namespace sensor_commands {
     return code;
   }
 
-  // http://www.gammon.com.au/serial
+  /*
+   * Saves bytes from Serial.read() until enter is pressed, and tries to run the corresponding command.
+   *   http://www.gammon.com.au/serial
+   */
   void processIncomingByte(const byte input_byte) {
     static char input_line[MAX_COMMAND_SIZE];
     static unsigned int input_pos = 0;