Expand reloadability explanation

Author: viesti

README.md

@@ -4,7 +4,7 @@ A library to sideload code into a live JVM/Clojure AWS Lambda.
 
 The idea is to first build a JVM/Clojure AWS Lambda in the usual way, by AOT compiling Clojure code into Java bytecode, but in the handler, call a sideloader, that puts new Clojure code into the Classpath, by downloading a zip from S3.
 
-If there is new Clojure code available, the sideloader calls `(require '<ns-sym> :reload-all)` to reload application namespaces.
+If there is new Clojure code available, the sideloader calls `(require '<ns-sym> :reload-all)` to reload application namespaces. The idea is to exclude Clojure source code from the AOT bundle, so when reloading with sideloaded Clojure code on the classpath, we let the Clojure compiler [pick up the new source code](https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/RT.java#L440-L460), if it is newer than the compiled class files
 
 There is an example in the [example](example/) folder, that uses [pod-babashka-fswatcher](https://github.com/babashka/pod-babashka-fswatcher) to package application Clojure code into a zip file and upload to S3, when there are changes in the source folder.