diff --git a/README.md b/README.md
index 25deeaf..8644157 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ docker run --rm -it nim65s/matrix-webhook -h
 ```
 
 ```
-usage: python -m matrix_webhook [-h] [-H HOST] [-P PORT] [-u MATRIX_URL] -i MATRIX_ID [-p MATRIX_PW] [-t MATRIX_TOKEN] -k API_KEY [-v]
+usage: python -m matrix_webhook [-h] [-H HOST] [-P PORT] [-u MATRIX_URL] -i MATRIX_ID (-p MATRIX_PW | -t MATRIX_TOKEN) -k API_KEY [-v]
 
 Configuration for Matrix Webhook.
 
diff --git a/matrix_webhook/conf.py b/matrix_webhook/conf.py
index 4273418..538ee18 100644
--- a/matrix_webhook/conf.py
+++ b/matrix_webhook/conf.py
@@ -33,16 +33,21 @@ parser.add_argument(
         else {"required": True}
     ),
 )
-parser.add_argument(
+auth = parser.add_mutually_exclusive_group(
+    required=all(v not in os.environ for v in ["MATRIX_PW", "MATRIX_TOKEN"])
+)
+auth.add_argument(
     "-p",
     "--matrix-pw",
-    help="matrix password. Either this or token required. Environment variable: `MATRIX_PW`",
+    help="matrix password. Either this or token required. "
+    "Environment variable: `MATRIX_PW`",
     **({"default": os.environ["MATRIX_PW"]} if "MATRIX_PW" in os.environ else {}),
 )
-parser.add_argument(
+auth.add_argument(
     "-t",
     "--matrix-token",
-    help="matrix access token. Either this or password required. Environment variable: `MATRIX_TOKEN`",
+    help="matrix access token. Either this or password required. "
+    "Environment variable: `MATRIX_TOKEN`",
     **({"default": os.environ["MATRIX_TOKEN"]} if "MATRIX_TOKEN" in os.environ else {}),
 )
 parser.add_argument(
@@ -61,10 +66,6 @@ parser.add_argument(
 
 args = parser.parse_args()
 
-if not (args.matrix_pw or args.matrix_token):
-    print("Error: Either MATRIX_PW or MATRIX_TOKEN needs to be provided")
-    exit(1)
-
 SERVER_ADDRESS = (args.host, args.port)
 MATRIX_URL = args.matrix_url
 MATRIX_ID = args.matrix_id