Update README.md

README.md

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 extract hyperpolarizability (and polarizability and dipole moment) components from Gaussian 09 output.
 
 
-1) You must use POLAR and #P keywords in the root section of your Gaussian input (for mp2 or higher level of calculation you should use Polar=cubic or Polar=EnOnly or Polar=DubleNumber, SEE: http://www.gaussian.com/g_tech/g_ur/k_polar.htm). 
+1) You must use POLAR and #P keywords in the root section of your Gaussian input (for mp2 or higher level of calculation you should use Polar=cubic or Polar=EnOnly or Polar=DubleNumber, SEE: http://www.gaussian.com/g_tech/g_ur/k_polar.htm) and also density=current. 
 
 2) Run Gaussian:  g09 < yourinput.com > youroutput.log