Merge pull request #25 from halprin/last-stuff

Update ReadMe

README.md

@@ -70,8 +70,8 @@ schema.
 ```yaml
 awsCredentialConfigPath: #the full path to folder holding your shared credentials and config files; optional; if unspecified, uses the executing user's ~/.aws/ folder
 aws_profile: #a profile specified in shared credentials and config files
-kms_key: #a KMS key ARN
-encryption_context: #a special value built into the encrypted file that, upon decryption, is verified
+kms_key: #a KMS key ARN; enables server-side encryption using this KMS key; optional; if unspecified, no server-side encryption is used
+encryption_context: #a special value used in server-side encryption; must be a string holding JSON which represents a string-string map; optional; defaults to an empty string and is unused if the KMS key is unspecified
 s3_bucket: #an S3 bucket name where the files are backed-up to
 backup:
   - title: #a title to give this specific back-up file