diff --git a/README.md b/README.md
index 3aa47eb199b03219c18b3a9439f3d741cb566079..7045d91e644dd6564bd189bc1d891281dd8a3c17 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# phy-exp
+# HUST physics experiment - script for data processing
 
 Pick what you want.
 
diff --git a/va/va.py b/va/va.py
old mode 100644
new mode 100755
index cb709f95cbcb6b8e1def2ed065959b26763d31be..9234310fd02dd69f9d007914b9cb0b9951ff062a
--- a/va/va.py
+++ b/va/va.py
@@ -1,3 +1,4 @@
+#!/bin/env python3
 import numpy
 import sys
 from quickmap import GetMap as draw
@@ -8,8 +9,7 @@ dat=numpy.loadtxt(sys.argv[1], delimiter=' ')
 Uraw,Iraw=dat[:,0],dat[:,1]
 U=[utrue/100*float(sys.argv[2]) for utrue in Uraw]
 I=[itrue/150*float(sys.argv[3]) for itrue in Iraw]
-# 1V 15mA. Edit it to adjust Ammeter/Voltmeter range.
 if sys.argv[4] == 'true':
-    draw(I,U,line=True,passO=True)
+    draw(U,I,6,4,line=True,passO=True)
 else:
-    draw(I,U)
+    draw(U,I,6,4)