--- old/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegionCounters.hpp	2019-11-11 16:09:57.998342828 +0100
+++ new/src/share/vm/gc_implementation/shenandoah/shenandoahHeapRegionCounters.hpp	2019-11-11 16:09:57.910342833 +0100
@@ -39,6 +39,7 @@
  *     - bit 0 set when marking in progress
  *     - bit 1 set when evacuation in progress
  *     - bit 2 set when update refs in progress
+ *     - bit 3 set when traversal in progress
  *
  * one variable counter per region, with $max_regions (see above) counters:
  * - sun.gc.shenandoah.regions.region.$i.data