diff --git a/README.md b/README.md
index 877aff5..4c2441d 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ python exporter.py --help
 
 ### Install/Run
 1. edit the docker-compose.yml file and put there the correct IP
-	(port and scrape interval are optional values)
+	(other values are optional)
 
 2. from command line run:
 ```
@@ -86,8 +86,10 @@ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' good
 curl http://<IP>:8787
 ```
 </br>
-</br>
 
-## TBD
+### Supported parameters
 
-- option to disable default python metrics
+`--inverter <inverterIP>`	- [required] IP address of the iverter. To get the IP Address, you can run the `inverter_scan.py` script.
+`--port <desired port>`		- [optional][default: 8787] port, on which the exporter should expose the metrics
+`--interval <interval (s)>`	- [optional][default: 30] interval between scrapings in seconds.
+`--energy-price <value>` 	- [optional][default: 0.15] energy price per kwh (in eur )
diff --git a/src/exporter.py b/src/exporter.py
index d164998..001d0c2 100644
--- a/src/exporter.py
+++ b/src/exporter.py
@@ -16,17 +16,19 @@ def checkArgs(argv):
     global EXPORTER_PORT
     global POLLING_INTERVAL
     global INVERTER_IP
+    global ENERGY_PRICE
 
     # set default values
     EXPORTER_PORT = 8787
     POLLING_INTERVAL = 30
+    ENERGY_PRICE = 0.15
     INVERTER_IP = ""
 
     # help
-    arg_help = "{0} --port <exporter port [default:8787]> --interval <scrape interval (seconds) [default:30]> --inverter <inverter IP>".format(argv[0])
+    arg_help = "{0} --port <exporter port [default:8787]> --interval <scrape interval (seconds) [default:30]> --inverter <inverter IP> --energy-price <price per KWh in eur [default: 0.15>".format(argv[0])
 
     try:
-        opts, args = getopt.getopt(argv[1:], "hp:t:i:", ["help", "port=", "interval=", "inverter="])
+        opts, args = getopt.getopt(argv[1:], "hp:t:i:", ["help", "port=", "interval=", "inverter=", "energy-price="])
     except:
         print(arg_help)
         sys.exit(2)
@@ -41,6 +43,8 @@ def checkArgs(argv):
             POLLING_INTERVAL = arg
         elif opt in ("-i", "--inverter"):
             INVERTER_IP = arg
+        elif opt in ("-e", "--energy-price"):
+            ENERGY_PRICE = arg
 
     # check if Inverter IP is set
     if not INVERTER_IP:
@@ -50,8 +54,9 @@ def checkArgs(argv):
 
 
 class InverterMetrics:
-    def __init__(self, g, i, POLLING_INTERVAL):
+    def __init__(self, g, i, POLLING_INTERVAL,ENERGY_PRICE):
         self.POLLING_INTERVAL = POLLING_INTERVAL
+        self.ENERGY_PRICE = ENERGY_PRICE
         self.metricsCount = 0
         self.g = g
         self.i = i
@@ -69,6 +74,9 @@ async def create_collector_registers():
                 elif sensor.id_ in runtime_data and sensor.id_ != "timestamp" and type(runtime_data[sensor.id_]) != int:
                     self.i.append(Info(sensor.id_, sensor.name))
 
+            # add additional energy-price
+            self.g.append(Gauge("energy_price", "Energy price per KW"))
+
         asyncio.run(create_collector_registers())
 
 
@@ -93,7 +101,9 @@ async def fetch_inverter():
                     self.g[countID].set(str(runtime_data[sensor.id_]))
                     countID+=1
 
-            self.metricsCount=len(self.g)-1
+            # set value for additional energy-price
+            self.g[countID].set(float(ENERGY_PRICE))
+            self.metricsCount=len(self.g)
 
         asyncio.run(fetch_inverter())
 
@@ -109,9 +119,11 @@ def main():
 
     print("polling interval:\t\t"+str(POLLING_INTERVAL)+"s")
     print("inverter scrape IP:\t\t"+str(INVERTER_IP))
+    print("energy price: \t\t\t"+str(ENERGY_PRICE)+"eur")
 
     inverter_metrics = InverterMetrics(
         POLLING_INTERVAL=int(POLLING_INTERVAL),
+        ENERGY_PRICE=ENERGY_PRICE,
         g=[],
         i=[]
     )