diff --git a/src/core/dryvrmain.py b/src/core/dryvrmain.py
index 4436a5f..ac4e772 100644
--- a/src/core/dryvrmain.py
+++ b/src/core/dryvrmain.py
@@ -48,6 +48,9 @@ def verify(data, simFunction, paramConfig={}):
     )
 
     # Build the progress graph for jupyter notebook
+    # isIpynb is used to detect if the coding is running
+    # on notebook or terminal, the graph will only be shown
+    # in notebook mode
     progressGraph = Graph(params, isIpynb())
 
     # Make sure the initial mode is specfieid if the graph is dag