docs: benefits of approach

Author: Christopher Drew

README.md

@@ -2,7 +2,10 @@
 
 This action uses the [AWS CLI](https://docs.aws.amazon.com/cli/index.html) to update a lambda function's code from a zip stored in an S3 bucket.
 
-This is in contrast to many other actions, which will deploy only a local zip file.
+This is in contrast to many other actions, which will deploy only a local zip file. The main benefits of this approach, in the author's opinion, are:
+
+1. Allows for asynchronous build and deploy phases.
+2. Allows for the deployment of larger file sizes.
 
 ## Usage