diff --git a/Cargo.toml b/Cargo.toml
index f3c2418..821a708 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "bitsy-parser"
-version = "6.5.0"
+version = "0.65.0"
 authors = ["Max Bradbury <max@tinybird.info>"]
 edition = "2018"
 
diff --git a/README.md b/README.md
index c04c85d..dc5fadf 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 a library for parsing Bitsy game data.
 
+the version number follows Bitsy itself, so version 0.65.* targets Bitsy 6.5.
+
 ## todo
 
 ### handle fancy exits