added note for Windows users

bash.md

@@ -492,6 +492,9 @@ The hard way is to call the appropriate interpreter explicitly:
     bash my_shell_script.sh
     python my_python_script.py
 
+**Note for Windows users:** In PowerShell, this way will work correctly
+for you. The following "easy way" will not!
+
 The easy way is to use a convention called *shebang* (short for
 "hash-bang"). The shell will look at the first line of an executable
 ASCII file. If that line begins with a shebang, the arguments to