diff --git a/IsegGUI.py b/IsegGUI.py
index 3d406d9..4afee5d 100755
--- a/IsegGUI.py
+++ b/IsegGUI.py
@@ -32,17 +32,16 @@ if useInfluxDBv1 == False :
 
 nArg = len(sys.argv)
 
-if nArg > 1 :
-  IP = sys.argv[1]
-else :
-  IP = input('Mpod IP address to connect : ')
-
-#Sergio MPOD 128.186.111.101
-#ANASEN MPOD 128.186.111.208
+if nArg == 1 :
+  IP = "192.168.1.155"
+else:
+  if nArg > 1 :
+    IP = sys.argv[1]
+  else :
+    IP = input('Mpod IP address to connect : ')
 
 pushToDB = False
 
-
 #============== assign a port, to prevent the script run mulitple time
 s = socket.socket()
 host = socket.gethostname()
diff --git a/README.md b/README.md
index ea16b91..0ccba19 100644
--- a/README.md
+++ b/README.md
@@ -1,17 +1,26 @@
 # Request packages
 
-in Ubuntu 20+
+## in Ubuntu 20+
 
     ~>sudo apt install python3-pyqt6 snmp snmp-mibs-downloader curl python3-pip libxcb-cursor0
     ~>python3 -m pip install pyqt6 influxdb-client
 
 also, download the https://fsunuc.physics.fsu.edu/wiki/images/5/53/WIENER-CRATE-MIB.txt and put in /usr/share/snmp/mibs/
 
+## in Mac
+
+install snmp, also
+
+    ~>python3 -m pip install pyqt6 influxdb-client
+
+also put the https://fsunuc.physics.fsu.edu/wiki/images/5/53/WIENER-CRATE-MIB.txt and put in /usr/share/snmp/mibs
 
 # Usage
 
     ~>python3 IsegGUI.py <IP>
 
+if no IP is set, the default is 192.168.1.155
+
 # DataBase connection
 
 for influxDB V1, simply put the database IP. since 2024, we upgraded to influxDB V2, a token is needed for secure connection. For Token, please check https://fsunuc.physics.fsu.edu/elog/fsunuc/28