diff --git a/src/lib.rs b/src/lib.rs
index d80700a..cc08a0d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-pub mod v1;
+pub mod v0;
 
 #[cfg(test)]
 mod tests;
diff --git a/src/tests.rs b/src/tests.rs
index b030ef4..d1d3f84 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -1,10 +1,10 @@
-use crate::v1::TimedBlockId;
+use crate::v0::TimedBlockId;
 
 #[test]
-fn _1()->Result<(),crate::v1::Error>{
+fn _1()->Result<(),crate::v0::Error>{
 	let file=std::fs::File::open("files/bhop_marble_7cf33a64-7120-4514-b9fa-4fe29d9523d").unwrap();
 	let input=std::io::BufReader::new(file);
-	let mut bot_file=crate::v1::File::new(input).unwrap();
+	let mut bot_file=crate::v0::File::new(input).unwrap();
 	println!("header={:?}",bot_file.header);
 	for &TimedBlockId{time,block_id} in &bot_file.header.offline_blocks_timeline{
 		println!("offline time={} block_id={:?}",time,block_id);
@@ -25,13 +25,13 @@ fn _1()->Result<(),crate::v1::Error>{
 }
 
 #[test]
-fn _2()->Result<(),crate::v1::Error>{
+fn _2()->Result<(),crate::v0::Error>{
 	let file=std::fs::File::open("files/bhop_marble_7cf33a64-7120-4514-b9fa-4fe29d9523d").unwrap();
 	let input=std::io::BufReader::new(file);
 
 	let t0=std::time::Instant::now();
 
-	let mut bot_file=crate::v1::File::new(input).unwrap();
+	let mut bot_file=crate::v0::File::new(input).unwrap();
 
 	let block=bot_file.read_all()?;
 
diff --git a/src/v1.rs b/src/v0.rs
similarity index 100%
rename from src/v1.rs
rename to src/v0.rs