diff --git a/crates/arr-api/src/subtitles.rs b/crates/arr-api/src/subtitles.rs
index 93e6e29..a33ffef 100644
--- a/crates/arr-api/src/subtitles.rs
+++ b/crates/arr-api/src/subtitles.rs
@@ -993,12 +993,18 @@ pub async fn translate(
 
     write_sidecar(&destination, &arr_subs::srt::render(&translated)).await?;
 
+    let sync = state.syncer().settle(&target.path, &destination).await;
+    if let Some(synced) = &sync.content {
+        write_sidecar(&destination, synced).await?;
+    }
+
     let record = arr_db::NewSubtitleFile::translated(
         target.media_file_id,
         &target_language.to_string(),
         &engine,
         &destination.to_string_lossy(),
-    );
+    )
+    .sync(db_sync_state(sync.state));
     finish(
         &state,
         &record,
@@ -1964,6 +1970,48 @@ mod tests {
         );
     }
 
+    /// §15: `alass` runs on every translated subtitle too (#217), not just
+    /// fetched ones.
+    #[tokio::test]
+    async fn a_translation_writes_the_synced_content_when_alass_accepts_it() {
+        let dir = tempfile::tempdir().expect("tempdir");
+        let binary = fake_alass(
+            dir.path(),
+            "printf '1\\n00:00:06,000 --> 00:00:07,000\\nOLA\\n' > \"$3\"\n",
+        )
+        .await;
+        let fixture = build_fixture(
+            vec![Arc::new(StubProvider::new("opensubtitles"))],
+            vec![Arc::new(StubBackend)],
+            arr_subs::Syncer::new().with_binary(&binary),
+        )
+        .await;
+        let (_, source) = grab(&fixture, pt()).await;
+        let source_id = source["id"].as_i64().expect("source id");
+
+        let response = reqwest::Client::new()
+            .post(format!(
+                "{}/api/media-files/1/subtitles/translate",
+                fixture.base
+            ))
+            .json(&serde_json::json!({
+                "source_subtitle_id": source_id,
+                "target_language": "en",
+                "engine": "openai"
+            }))
+            .send()
+            .await
+            .expect("translate");
+        assert_eq!(response.status(), StatusCode::CREATED);
+        let body: serde_json::Value = response.json().await.expect("json");
+        assert_eq!(body["sync"], "synced");
+        let sidecar = PathBuf::from(body["path"].as_str().expect("path"));
+        assert_eq!(
+            tokio::fs::read_to_string(&sidecar).await.expect("sidecar"),
+            "1\n00:00:06,000 --> 00:00:07,000\nOLA\n"
+        );
+    }
+
     /// §15 allows a machine translation as the source of another one.
     #[tokio::test]
     async fn a_machine_translation_is_itself_a_legal_source() {