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-rw-r--r--js/src/vm/ReceiverGuard.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/js/src/vm/ReceiverGuard.h b/js/src/vm/ReceiverGuard.h
index c14f0d83b..459cc0012 100644
--- a/js/src/vm/ReceiverGuard.h
+++ b/js/src/vm/ReceiverGuard.h
@@ -28,6 +28,11 @@ namespace js {
// TypedObject: The structure of a typed object is determined by its group.
// All typed objects with the same group have the same class, prototype, and
// own properties.
+//
+// UnboxedPlainObject: The structure of an unboxed plain object is determined
+// by its group and its expando object's shape, if there is one. All unboxed
+// plain objects with the same group and expando shape have the same
+// properties except those stored in the expando's dense elements.
class HeapReceiverGuard;
class RootedReceiverGuard;