diff --git a/dap/worker.py b/dap/worker.py
index 14e3e10..aa61af0 100644
--- a/dap/worker.py
+++ b/dap/worker.py
@@ -20,7 +20,7 @@ def main():
     parser.add_argument("--visualisation_host", default="localhost")
     parser.add_argument("--visualisation_port", type=int, default=13002)
     parser.add_argument("--peakfinder_parameters", default=None, help="json file with peakfinder parameters")
-    parser.add_argument("--skip_frames_rate", type=int, default=1, help="skip (approximately) skip_frames_rate % of pulses")
+    parser.add_argument("--skip_frames_rate", type=int, default=1, help="skip (approximately) skip_frames_rate %% of pulses")
 
     clargs = parser.parse_args()