Update README.md

README.md

@@ -1,2 +1,2 @@
 # getopt-for-windows
-getopt.h and getopt.c is very often used in linux, to make it easy for windows user, two files were extracted from glibc 
+getopt.h and getopt.c is very often used in linux, to make it easy for windows user, two files were extracted from glibc. In order to make it works properly in windows, some modification was done and you may compare the change using original source files. Enjoy it!