diff --git a/jetstream/core/orchestrator.py b/jetstream/core/orchestrator.py
index ee51aade..1a2b7a88 100644
--- a/jetstream/core/orchestrator.py
+++ b/jetstream/core/orchestrator.py
@@ -571,9 +571,11 @@ def _transfer_thread(self, idx: int):
       self._generate_backlogs[target_idx].put(new_request, block=True)
       logging.info(
           "Successfully transferred prefill "
-          "from prefill engine %d to generate engine %d.",
+          "from prefill engine %d to generate engine %d "
+          "(%d requests now in backlog).",
           idx,
           target_idx,
+          self._generate_backlogs[target_idx].qsize(),
       )
 
   def _generate_thread(self, idx: int):