diff --git a/hive-c0re/src/forge.rs b/hive-c0re/src/forge.rs
index 35b69808..85a9d90e 100644
--- a/hive-c0re/src/forge.rs
+++ b/hive-c0re/src/forge.rs
@@ -959,8 +959,8 @@ async fn ensure_mirrors(admin_token: &str) {
 
 /// Create `owner/repo` as a pull-mirror of `upstream` via the migrate API.
 /// Idempotent: a cheap existence check skips an already-seeded mirror (it
-/// persists in the non-ephemeral forge state across reboots), and a
-/// 409/422 from migrate is also treated as success.
+/// persists in the non-ephemeral forge state across reboots); a 409 (a race
+/// between that check and the POST) is also treated as success.
 async fn ensure_mirror_repo(
     upstream: &str,
     owner: &str,