From 4f2a61e88edcd45eb78699f597c82f89a84bc136 Mon Sep 17 00:00:00 2001
From: Georgy Evtushenko <evtushenko.georgy@gmail.com>
Date: Thu, 25 May 2023 22:47:06 +0400
Subject: [PATCH] Comment on the synchronous nature of prefix

---
 examples/device/example_device_decoupled_look_back.cu | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/examples/device/example_device_decoupled_look_back.cu b/examples/device/example_device_decoupled_look_back.cu
index a95301e7e..904a24fa9 100644
--- a/examples/device/example_device_decoupled_look_back.cu
+++ b/examples/device/example_device_decoupled_look_back.cu
@@ -75,6 +75,8 @@ __global__ void decoupled_look_back_kernel(cub::ScanTileState<MessageT> tile_sta
 
     if (warp_id == 0)
     {
+      // Perform the decoupled look-back
+      // Invocation of the prefix will block until the look-back is complete.
       MessageT exclusive_prefix = prefix(block_aggregate);
 
       if (tid == 0)