diff --git a/src/bin/topola-cli/main.rs b/src/bin/topola-cli/main.rs
index 346b4ae..1df7cc5 100644
--- a/src/bin/topola-cli/main.rs
+++ b/src/bin/topola-cli/main.rs
@@ -7,7 +7,7 @@ use std::io::BufReader;
 struct Cli {
     input: std::path::PathBuf,
     output: std::path::PathBuf,
-    history: Option<std::path::PathBuf>,
+    history: std::path::PathBuf,
 }
 
 fn main() -> Result<(), std::io::Error> {
@@ -19,14 +19,15 @@ fn main() -> Result<(), std::io::Error> {
     let design = topola::specctra::design::SpecctraDesign::load(design_bufread).unwrap();
     let board = design.make_board();
 
-    if let Some(history) = args.history {
-        let history_file = File::open(history)?;
-        let mut history_bufread = BufReader::new(history_file);
-        let mut invoker = topola::autorouter::invoker::Invoker::new(
-            topola::autorouter::Autorouter::new(board).unwrap(),
-        );
-        invoker.replay(serde_json::from_reader(history_bufread).unwrap())
-    }
+    let history_file = File::open(args.history)?;
+    let mut history_bufread = BufReader::new(history_file);
+    let mut invoker = topola::autorouter::invoker::Invoker::new(
+        topola::autorouter::Autorouter::new(board).unwrap(),
+    );
+    invoker.replay(serde_json::from_reader(history_bufread).unwrap());
+
+    let mut file = File::create(args.output).unwrap();
+    design.write_ses(invoker.autorouter().board(), &mut file);
 
     Ok(())
 }