diff --git a/sycl/test-e2e/KernelFusion/Reduction/group_reduce_and_last_wg_detection.cpp b/sycl/test-e2e/KernelFusion/Reduction/group_reduce_and_last_wg_detection.cpp
index fe1b5893a7b6c..500847379d864 100644
--- a/sycl/test-e2e/KernelFusion/Reduction/group_reduce_and_last_wg_detection.cpp
+++ b/sycl/test-e2e/KernelFusion/Reduction/group_reduce_and_last_wg_detection.cpp
@@ -2,6 +2,9 @@
 // RUN: %{run} %t.out
 // UNSUPPORTED: hip || cuda
 
+// COM: When ran on HIP and CUDA, this algorithm launches 'memcpy' commands
+// leading to an infinite loop due to a bug in kernel fusion.
+
 #include "./reduction.hpp"
 
 int main() {