diff --git a/simulations/airshower_beacon_simulation/scriptlib.py b/simulations/airshower_beacon_simulation/scriptlib.py
index 165f32f..0edc5d6 100644
--- a/simulations/airshower_beacon_simulation/scriptlib.py
+++ b/simulations/airshower_beacon_simulation/scriptlib.py
@@ -4,9 +4,13 @@ Some preconfigured ArgumentParser
 
 from argparse import ArgumentParser
 
-def MyArgumentParser(default_fig_dir='./figures', default_show_plots=False, **kwargs):
+def MyArgumentParser(
+        default_fig_dir='./figures',
+        default_show_plots=False,
+        **kwargs):
     """
-    A somewhat preconfigured ArgumentParser
+    A somewhat preconfigured ArgumentParser to be shared across
+    multiple scripts.
 
     Set show_plots=True to by default enable showing plots.
     Likewise, set fig_dir=None to by default disable saving figures.
@@ -14,11 +18,11 @@ def MyArgumentParser(default_fig_dir='./figures', default_show_plots=False, **kw
     parser = ArgumentParser(**kwargs)
 
     # Whether to show plots
-    parser.add_argument('--show-plots', action='store_true')
-    parser.add_argument('--no-show-plots', dest='show-plots', action='store_false')
-    parser.set_defaults(show_plots=default_show_plots)
+    group1 = parser.add_mutually_exclusive_group(required=False)
+    group1.add_argument('--show-plots', action='store_true', default=default_show_plots, help='Default: %(default)s')
+    group1.add_argument('--no-show-plots', dest='show-plots', action='store_false')
 
     # Figures directory
-    parser.add_argument('--fig-dir', type=str, default=default_fig_dir)
+    parser.add_argument('--fig-dir', type=str, default=default_fig_dir, help='Set None to disable saving figures. (Default: %(default)s)')
 
     return parser