diff --git a/loopy/schedule/__init__.py b/loopy/schedule/__init__.py
index ffef62cf8b4f7cc65a3c11e06c7d42c23d18eafd..9110c4ac079c614ce6a078bbe986888db3c21422 100644
--- a/loopy/schedule/__init__.py
+++ b/loopy/schedule/__init__.py
@@ -1138,7 +1138,8 @@ def convert_barrier_instructions_to_barriers(kernel, schedule):
             if isinstance(insn, BarrierInstruction):
                 result.append(Barrier(
                     kind=insn.kind,
-                    originating_insn_id=insn.id))
+                    originating_insn_id=insn.id,
+                    comment="Barrier inserted due to %s" % insn.id))
                 continue
 
         result.append(sched_item)