Update README.md

README.md

@@ -9,8 +9,9 @@ Installation
   
 ###Installation
 ```Python
-Python setup.py install
+python setup.py install
 ```
+Add the ```seispy/Scripts``` to environment	variables.
 Inclusion
 --------------
   * seispy.distaz: Calculate distance and azimuth (by [the lithospheric seismology program at USC](http://www.seis.sc.edu/software/distaz/)).<br />