diff --git a/mediapipe/calculators/core/begin_loop_calculator.h b/mediapipe/calculators/core/begin_loop_calculator.h
index a9d29e687..6d17f9953 100644
--- a/mediapipe/calculators/core/begin_loop_calculator.h
+++ b/mediapipe/calculators/core/begin_loop_calculator.h
@@ -49,7 +49,7 @@ namespace mediapipe {
 //   calculator:    "EndLoopWithOutputCalculator"
 //   input_stream:  "ITEM:output_of_loop_body"     # ItemU     @loop_internal_ts
 //   input_stream:  "BATCH_END:ext_ts"             # Timestamp @loop_internal_ts
-//   output_stream: "OUTPUT:aggregated_result"     # IterableU @ext_ts
+//   output_stream: "ITERABLE:aggregated_result"   # IterableU @ext_ts
 // }
 //
 // Input streams tagged with "CLONE" are cloned to the corresponding output