diff --git a/intern/cycles/kernel/bvh/bvh_shadow_all.h b/intern/cycles/kernel/bvh/bvh_shadow_all.h
index 0c0a877cdff..f3dc5cf195f 100644
--- a/intern/cycles/kernel/bvh/bvh_shadow_all.h
+++ b/intern/cycles/kernel/bvh/bvh_shadow_all.h
@@ -343,6 +343,7 @@ bool BVH_FUNCTION_FULL_NAME(BVH)(KernelGlobals *kg,
 		if(stack_ptr >= 0) {
 			kernel_assert(object != OBJECT_NONE);
 
+			/* Instance pop. */
 			if(num_hits_in_instance) {
 				float t_fac;
 
diff --git a/intern/cycles/kernel/bvh/bvh_volume_all.h b/intern/cycles/kernel/bvh/bvh_volume_all.h
index 1f6515c9862..67b25625cc4 100644
--- a/intern/cycles/kernel/bvh/bvh_volume_all.h
+++ b/intern/cycles/kernel/bvh/bvh_volume_all.h
@@ -334,6 +334,7 @@ uint BVH_FUNCTION_FULL_NAME(BVH)(KernelGlobals *kg,
 		if(stack_ptr >= 0) {
 			kernel_assert(object != OBJECT_NONE);
 
+			/* Instance pop. */
 			if(num_hits_in_instance) {
 				float t_fac;
 #  if BVH_FEATURE(BVH_MOTION)
diff --git a/intern/cycles/kernel/bvh/qbvh_shadow_all.h b/intern/cycles/kernel/bvh/qbvh_shadow_all.h
index 73dd18ad2bd..03c678bd986 100644
--- a/intern/cycles/kernel/bvh/qbvh_shadow_all.h
+++ b/intern/cycles/kernel/bvh/qbvh_shadow_all.h
@@ -427,6 +427,7 @@ ccl_device bool BVH_FUNCTION_FULL_NAME(QBVH)(KernelGlobals *kg,
 		if(stack_ptr >= 0) {
 			kernel_assert(object != OBJECT_NONE);
 
+			/* Instance pop. */
 			if(num_hits_in_instance) {
 				float t_fac;