diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 7d31f6bf19..cc9dfce30f 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -2111,6 +2111,8 @@ void GCode::process_layer(
                         instance_to_print.object_by_extruder.support->chained_path_from(m_last_pos, instance_to_print.object_by_extruder.support_extrusion_role));
                     m_layer = layers[instance_to_print.layer_id].layer();
                 }
+                //FIXME order islands?
+                // Sequential tool path ordering of multiple parts within the same object, aka. perimeter tracking (#5511)
                 for (ObjectByExtruder::Island &island : instance_to_print.object_by_extruder.islands) {
                     const auto& by_region_specific = is_anything_overridden ? island.by_region_per_copy(by_region_per_copy_cache, static_cast<unsigned int>(instance_to_print.instance_id), extruder_id, print_wipe_extrusions != 0) : island.by_region;
                     //FIXME the following code prints regions in the order they are defined, the path is not optimized in any way.