diff --git a/bundles.md b/bundles.md
index e28b0cb..17d8c43 100644
--- a/bundles.md
+++ b/bundles.md
@@ -1,3 +1,5 @@
-# Binary Spec for Bundle Files
+# Bundle File Specification (WIP)
 
-We're not ready for this yet. If you would like to help, please reach out.
+We will draft this specification after the first client is finished- we've found that too many things have changed since the start of the project.
+
+Please see this [Lexer](https://tildegit.org/PigeonProtocolConsortium/pigeon_ruby/src/branch/master/dist/pigeon/lexer.rb), written in Ruby, that can help you build your own bundle-consuming code: