Add instructions on how to update files for next workshop

README.md

@@ -21,6 +21,16 @@ labeled `RBB01`):
 
     find /Volumes/RBB01/* -type f -exec rsync '{}' cache ';'
 
+# Updating files for the next workshop
+
+1. Open up `files.yml`.
+1. Change the `railsbridgebm-YYYY-MM.box` key to the new box name.
+1. Change the download URL for that box.
+1. Save and run `./build-spoons`.
+
+Make sure you make a new commit for these updates! (We should probably make this
+more dynamic so that we don't have to change th code every time...)
+
 # Troubleshooting
 
 If you get the error:
@@ -34,7 +44,3 @@ CA certificate bundle. Try updating Ruby to at least 2.3.0.
 
 New drives should be formated with a name starting with `RBB` and then a
 number.
-
-# Updating files for the next workshop
-
-TODO: write this section.