diff --git a/csst_ifs_sim/help/demo.py b/csst_ifs_sim/help/demo.py
index 719ea7c6a065dd142356d44fb6cd037a9dca833e..d218f1a26a9bf5fe8d3e293383c695c34c37bf7e 100644
--- a/csst_ifs_sim/help/demo.py
+++ b/csst_ifs_sim/help/demo.py
@@ -25,4 +25,4 @@ iLoop = 1
 # When the last parameter is yes and sourcein is LAMP,
 # the Hole simulation is executed.
 csst_ifs_sim.runIFSsim(sourcein, configfile,
-                       dir_path, result_path, iLoop, debug, 'no')
\ No newline at end of file
+                       dir_path, result_path, iLoop, debug, 'no')