diff --git a/README.md b/README.md
new file mode 100644
index 0000000..76bff25
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# reproduction
+
+To reproduce the issue, run `./repro.sh`.
+
+This will clean the build, and then toggle two lines between
+```
+// 1
+// 2
+```
+```
+// 1
+```
+which is enough to trigger the issue.
+
+**Make sure to `export RUSTFLAGS=-Zincremental-verify-ich` first, otherwise it may not reproduce**.
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index b970152..17c012a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -53,7 +53,7 @@ pub async fn bar_baz() {
 }
 
 // 1
-    // 2
+// 2
 
 #[derive(proc_macro_thing::MyMacro)]
 #[helper]
diff --git a/toggle.js b/toggle.js
index bd68610..14ca15a 100644
--- a/toggle.js
+++ b/toggle.js
@@ -7,7 +7,7 @@ const one = c.findIndex(l => l.includes("// 1"));
 if (c[one + 1].includes("// 2")) {
     c.splice(one + 1, 1);
 } else {
-    c.splice(one + 1, 0, "    // 2")
+    c.splice(one + 1, 0, "// 2")
 }
 
 fs.writeFileSync("src/main.rs", c.join("\n"));