diff --git a/script/local.py b/script/local.py
index d083fff..01297ce 100644
--- a/script/local.py
+++ b/script/local.py
@@ -17,8 +17,13 @@ crystal.setTrustedMonitor(True)
 
 
 def setup_brag_plot(auto=True):
-    """
-    Defines plot range so that bragg motor using external encoder will be plotted
+    """Defines plot range so that bragg motor using external encoder will be plotted
+    
+    Args:
+        auto(bool): if True range is automatic. Else, it is calculated based on current offset.
+
+    Returns:
+        None    
     """
     if auto:
         setup_plotting(range = "auto")