diff --git a/src/runtime/mcheckmark.go b/src/runtime/mcheckmark.go
index ebb19a0ceb..318f40f2eb 100644
--- a/src/runtime/mcheckmark.go
+++ b/src/runtime/mcheckmark.go
@@ -177,6 +177,9 @@ func checkFinalizersAndCleanups() {
 		}
 
 		// Run a checkmark GC using this cleanup and/or finalizer as a root.
+		if debug.checkfinalizers > 1 {
+			print("Scan trace for cleanup/finalizer on ", hex(p), ":\n")
+		}
 		runCheckmark(func(gcw *gcWork) {
 			switch sp.kind {
 			case _KindSpecialFinalizer:
@@ -185,6 +188,9 @@ func checkFinalizersAndCleanups() {
 				gcScanCleanup((*specialCleanup)(unsafe.Pointer(sp)), gcw)
 			}
 		})
+		if debug.checkfinalizers > 1 {
+			println()
+		}
 
 		// Now check to see if the object the special is attached to was marked.
 		// The roots above do not directly mark p, so if it is marked, then p
diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go
index 41a4b1ab5a..b5318e56f8 100644
--- a/src/runtime/mgcmark.go
+++ b/src/runtime/mgcmark.go
@@ -1665,6 +1665,9 @@ func greyobject(obj, base, off uintptr, span *mspan, gcw *gcWork, objIndex uintp
 			// Already marked.
 			return
 		}
+		if debug.checkfinalizers > 1 {
+			print("  mark ", hex(obj), " found at *(", hex(base), "+", hex(off), ")\n")
+		}
 	} else {
 		if debug.gccheckmark > 0 && span.isFree(objIndex) {
 			print("runtime: marking free object ", hex(obj), " found at *(", hex(base), "+", hex(off), ")\n")