diff --git a/tests/test-subrepo.t b/tests/test-subrepo.t
index 5e92ba77793c1b481999733d9865559c36172b5c_dGVzdHMvdGVzdC1zdWJyZXBvLnQ=..3433bf56b768e5a8358ed637b2a2fc2262adb0e2_dGVzdHMvdGVzdC1zdWJyZXBvLnQ= 100644
--- a/tests/test-subrepo.t
+++ b/tests/test-subrepo.t
@@ -311,6 +311,7 @@
    branchmerge: True, force: False, partial: False
    ancestor: 6747d179aa9a, local: 20a0db6fbf6c+, remote: 7af322bc1198
    preserving t for resolve of t
+  starting 4 threads for background file closing (?)
    t: versions differ -> m (premerge)
   picked tool ':merge' for t (binary False symlink False changedelete False)
   merging t