README again

README.md

@@ -8,14 +8,14 @@ Small script to pair with the Dockerfile `ADD` directive to make an idempotent a
 
 A Dockerfile's `ADD` directive is a bit [finicky](https://docs.docker.com/engine/reference/builder/#add). It allows files to be added to the image either from a local directory or a remote URL. This has value in that if the `<src>` of the `ADD` is an `ARG`, then the functionality of the `ADD` can be changed with build-time arguments.
 
-For example, this allows development to lazily get the latest version of the dependency from a tar archive at some remote URL while CI consistently downloads the same tar archive and passes it to the Dockerfile as a `--build-arg`.
+For example, this allows developers to lazily get the latest version of the dependency from a tar archive at some remote URL while CI consistently supplies the same tar archive to the Dockerfile as a `--build-arg`.
 
-However, if that `<src>` is expected to be either a local tar archive or a remote tar archive, the `ADD` directive is not idempotent; subsequent Dockerfile directives would have to account for this difference.
-
-## usage
+However, if that `<src>` is expected to be either a local tar archive or a remote tar archive, the `ADD` directive is not idempotent; `ADD` unpacks local tar archives but not remote ones. As a result, subsequent Dockerfile directives would have to account for the difference to make the build successful.
 
 This is where the ADDendum comes in:
 
+## usage
+
 ```Dockerfile
 ARG zip=zip_3.0_x86_64.tgz
 ADD ${zip} /usr/local/bin