diff --git a/README.md b/README.md
index 2c801cf..9f302e1 100644
--- a/README.md
+++ b/README.md
@@ -33,4 +33,68 @@ To get a list of all command line parameters, start the program with the "--help
   TheBus2Komsi --help
   ```
 
+
+## Testing if the API works
+
+To test whether the connection to the API (called "Telemetry" in Game) of TheBus works without having set up a serial port, you can start the program "TheBusTestAPI" instead of "TheBus2Komsi".
+
+You should see similar output:
+  ```
+Verbose Mode enabled.
+TheBus2Komsi has started. Have fun!
+Bitte einsteigen und hinsetzen.
+  ```
+
+And as soon as you sit in the driver's seat of a bus and, for example, turn on the ignition, you should see the variables read and changing:
+
+  ```
+Verbose Mode enabled.
+TheBus2Komsi has started. Have fun!
+Bitte einsteigen und hinsetzen.
+Hingesetzt. Jetzt gehts los!
+doors: 0 -> 1
+fixing_brake: 0 -> 1
+ignition: 0 -> 1
+lights_stop_brake: 0 -> 1
+lights_front_door: 0 -> 1
+fuel:  0 -> 1
+fuel:  1 -> 4
+fuel:  4 -> 7
+fuel:  7 -> 10
+fuel:  10 -> 13
+fuel:  13 -> 16
+fuel:  16 -> 19
+fuel:  19 -> 22
+fuel:  22 -> 25
+fuel:  25 -> 28
+fuel:  28 -> 31
+fuel:  31 -> 34
+fuel:  34 -> 37
+fuel:  37 -> 40
+fuel:  40 -> 43
+fuel:  43 -> 46
+fuel:  46 -> 49
+fuel:  49 -> 52
+fuel:  52 -> 55
+fuel:  55 -> 58
+fuel:  58 -> 61
+fuel:  61 -> 64
+fuel:  64 -> 67
+fuel:  67 -> 70
+fuel:  70 -> 73
+fuel:  73 -> 76
+fuel:  76 -> 79
+fuel:  79 -> 82
+fuel:  82 -> 85
+fuel:  85 -> 88
+fuel:  88 -> 91
+fuel:  91 -> 94
+fuel:  94 -> 97
+fuel:  97 -> 100
+  ```
+
+If you see such or similar output, then reading the API is working.
+
+If you don't see the variables, you can start the program with the "-d" (debug) option, which gives you a lot more information, although this might be too cryptic for some.
+
 Have fun!