diff --git a/prometheuspvesd/cli.py b/prometheuspvesd/cli.py
index ded0180..cdc279e 100644
--- a/prometheuspvesd/cli.py
+++ b/prometheuspvesd/cli.py
@@ -41,6 +41,13 @@ class PrometheusSD:
         parser.add_argument(
             "-o", "--output", dest="output_file", action="store", help="output file"
         )
+        parser.add_argument(
+            "-d",
+            "--loop-delay",
+            dest="loop_delay",
+            action="store",
+            help="delay between discovery runs"
+        )
         parser.add_argument(
             "-v", dest="logging.level", action="append_const", const=-1, help="increase log level"
         )