Add mysql port info.

content/anvil/using_mysql.md

@@ -24,7 +24,7 @@ or [Mac]({{< relref "connecting_to_linux_instances_from_mac" >}}) as needed.
 
 This guide assumes you have already created an instance using the `MySQL Server` image.
 In order to access the database, two additional steps are required.  A
-_Security Group_ must be created in OpenStack to allow access to the MySQL port,
+_Security Group_ must be created in OpenStack to allow access to the MySQL port (3306),
 and the randomly generated password must be recovered.
 
 ### Create and attach a security group
@@ -120,6 +120,7 @@ column entry on the *Instances* page:
 
 Using the username `root` along with the recovered password and the IP
 address, you can now connect to MySQL using the program of your choice.
+By default, MySQL runs on port 3306.
 
 For example, using the command line client: