readme.md in rubrowser-2.3.0 vs readme.md in rubrowser-2.4.0

@@ -51,10 +51,11 @@
 
 
 ```
 Usage: rubrowser [options] [file] ...
     -o, --output=FILE                output file page, if not specified output will be written to stdout
+    -l, --layout=FILE                layout file to apply on the resulting graph
     -T, --no-toolbox                 Don't display toolbox on the page
     -v, --version                    Print Rubrowser version
     -h, --help                       Prints this help
 ```
 
@@ -82,9 +83,10 @@
 * change graph appearance (collision radius)
 * stop animation immediately
 * Module/class circle size on the graph will be relative to module number of
   lines in your code
 * cyclical dependencies are marked in red
+* after you move nodes around, you can download the layout as a file, then provide it when generating the graph file again with `-l file.json` it will embed the layout in the file and the graph will have the same layout by default.
 
 ## Why?
 
 Because i didn't find a good visualization tool to make me understand ruby
 projects when I join a new one.