diff --git a/js/src/vm/TypedArrayObject.cpp b/js/src/vm/TypedArrayObject.cpp
index 521afff36ba1..55ff807efb8a 100644
--- a/js/src/vm/TypedArrayObject.cpp
+++ b/js/src/vm/TypedArrayObject.cpp
@@ -1341,14 +1341,15 @@ ArrayBufferViewObject::trace(JSTracer *trc, JSObject *obj)
     HeapSlot &bufSlot = obj->getReservedSlotRef(BUFFER_SLOT);
     MarkSlot(trc, &bufSlot, "typedarray.buffer");
 
-    /* Update obj's data slot if the array buffer moved. */
+    /* Update obj's data slot if the array buffer moved. Note that during
+     * initialization, bufSlot may still be JSVAL_VOID. */
     if (bufSlot.isObject()) {
         ArrayBufferObject &buf = bufSlot.toObject().as<ArrayBufferObject>();
         int32_t offset = obj->getReservedSlot(BYTEOFFSET_SLOT).toInt32();
         obj->initPrivate(buf.dataPointer() + offset);
     }
 
-    /* Update NEXT_VEIW_SLOT, if the view moved. */
+    /* Update NEXT_VIEW_SLOT, if the view moved. */
     IsSlotMarked(&obj->getReservedSlotRef(NEXT_VIEW_SLOT));
 }