README.md in aws-rds-0.1.2 vs README.md in aws-rds-0.2.0

@@ -2,45 +2,45 @@
 
 Simple tool to create AWS RDS db instances consistently with pre-configured settings.  The pre-configured settings are stored in files in the profiles folder of the current directory.
 
 For example, say you have:
 
-* profiles/default.yml: default settings.  Takes the lowest precedence.
-* profiles/mydb.yml: mydb settings get combined with the default settings
+* profiles/default.yml: default settings, when no profile is specified.
+* profiles/mydb.yml: mydb settings.
 
 ## Usage
 
 ```sh
 aws-rds create mydb --profile mydb --db-name mydbname
 ```
 
 * mydb will be the RDS database identifier show on the AWS console
 * mydbname is the database name that contains the tables
 
-In a nutshell, the profile parameters are passed to the ruby aws-sdk [AWS::RDS::Client#create_db_instance](https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/RDS/Client.html#create_db_instance-instance_method) method.  So you can specify any parameter you wish that is available there.  To check out what a profile looks like look at the [example default](example/profiles/default.yml)
+In a nutshell, the profile parameters are passed to the ruby aws-sdk [AWS::RDS::Client#create_db_instance](https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/RDS/Client.html#create_db_instance-instance_method) method.  So you can specify any parameter you wish that is available in the aws-sdk.  To check out what a profile looks like view the [example default](example/profiles/default.yml)
 
 ## config
 
-This is where you put common global settings. The required settings are listed below.  Example:
+You can configure common global settings. The required settings are listed below.  Example:
 
 `config/development.yml`
 
 ```yaml
 vpc_id: vpc-123 # falls back to this vpc if not specified in the profile
 db_subnet_group_name: private-subnet-group-name # fallback db_subnet_group_name whe not set
 ```
 
 ## Security Group Creation
 
-The tool automatically creates a security group and associates it with the newly created db. This is done so that you can use it to control access to the database in finely tune manner. Otherwise, the default security group is associated with the db.
+The tool automatically creates a security group and associates it with the newly created db. Normally the default security group is associated with the db. A new security group allows you to control access to the database in finely tune manner without affecting the default security group.
 
 ## Convention
 
-By convention, the security-group and profile will match the db identifier.  So if the db identifier matches the commands the be simplified.  Examples:
+By convention, the security-group name is the same as the db identifier.  So if the db identifier matches the commands the be simplified.  Examples:
 
 ```
-aws-rds create mydb --security-group-name mydb --profile mydb
-aws-rds create mydb # same as above
+aws-rds create mydb --profile myprofile --security-group-name mydb
+aws-rds create mydb --profile myprofile # same as above
 ```
 
 ## More Help
 
 ```sh