adding first users in user table

[Adam Hardy]

Hi Listers,
I have just installed mysql following the instructions for the binary 
distro under linux and I added my root user and password using 
mysqladmin as mentioned in scripts/mysql_install_db.

In the mysql.user table I see my root@localhost and root@stripped 
but I also see two entries with blank user names.

| host                    | user
+-------------------------+------
| localhost               | root
| localhost               |     
| harda1.myserver.com | root
| harda1.myserver.com |     
+-------------------------+------
4 rows in set (0.00 sec)

Have I made a mistake that inserted these 2 blank users? Or are they 
there for a good reason?

Thanks
Adam