diff --git a/crates/ide_assists/src/handlers/promote_mod_file.rs b/crates/ide_assists/src/handlers/promote_mod_file.rs
index 2ba51d169929..5991c0989fec 100644
--- a/crates/ide_assists/src/handlers/promote_mod_file.rs
+++ b/crates/ide_assists/src/handlers/promote_mod_file.rs
@@ -14,12 +14,13 @@ use crate::assist_context::{AssistContext, Assists};
 // Moves inline module's contents to a separate file.
 //
 // ```
-// // a.rs
+// //- /main.rs
+// mod a;
+// //- /a.rs
 // $0fn t() {}
 // ```
 // ->
 // ```
-// // /a/mod.rs
 // fn t() {}
 // ```
 pub(crate) fn promote_mod_file(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
diff --git a/crates/ide_assists/src/tests/generated.rs b/crates/ide_assists/src/tests/generated.rs
index 39ab8c7b74e0..98e0bd674890 100644
--- a/crates/ide_assists/src/tests/generated.rs
+++ b/crates/ide_assists/src/tests/generated.rs
@@ -1226,6 +1226,22 @@ mod foo;
     )
 }
 
+#[test]
+fn doctest_promote_mod_file() {
+    check_doc_test(
+        "promote_mod_file",
+        r#####"
+//- /main.rs
+mod a;
+//- /a.rs
+$0fn t() {}
+"#####,
+        r#####"
+fn t() {}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_pull_assignment_up() {
     check_doc_test(