Update README.md

README.md

@@ -1,11 +1,13 @@
 # PDF Flattener
 
-Properly redacting PDF files is an expensive job.
-Oftentimes, files are released with the impression that they are redacted.
+Properly redacting PDF files can be an expensive job.
+Oftentimes, files are released with the impression that they are redacted because you can *see* the redacted text.
 In reality, those big black rectangles can be removed quite easily with the [right editor](https://inkscape.org/),
 leaving behind the confidential text that should have been removed.
 
-When a PDF is flattened, the layered content (i.e. those floating black rectangles) is all combined into a single layer.
+Preseving PDF form content can be a concern as well.  How can we be assured that form content is not altered after we receive it?
+
+When a PDF is flattened, the layered content, like those floating black rectangles and form fields, are all combined into a single image layer.
 
 There are many high cost solutions to achieve this.
 It can also be done with freely available PDF libraries.
@@ -14,9 +16,20 @@ This project is licensed under the same license.
 
 ## Libraries Used
 
-All libraries used are licensed under [the Apache License](https://www.apache.org/licenses/).
+This project, along with all the libraries it uses are licensed under [the Apache License](https://www.apache.org/licenses/).
 
 - [Apache PDFBox](https://pdfbox.apache.org/)
 - [Apache Commons Logging](https://commons.apache.org/proper/commons-logging/)
 
 For convenience, these binaries are bundled into the main build.
+
+## Requirements
+
+- PDFBox requires at least Java 8 to run.  This project is compiled to work with Java 8 or better.
+- Memory.  Depending on the size of your PDF, it may take over 1 GB of memory to process it.
+
+## Usage
+
+Check the Releases for an executable JAR file.  Note that the executable JAR makes use of Java's `JFileChooser` class, so a GUI is required.
+
+Alternatively, you can include the JAR file in your project, and call the static `flattenPDF(File src, File dest)` method.