diff --git a/src/store/modules/reading.js b/src/store/modules/reading.js
index bf714331..e3a7eb1b 100644
--- a/src/store/modules/reading.js
+++ b/src/store/modules/reading.js
@@ -888,6 +888,7 @@ const actions = {
                       imageIds.push(imageId)
                     })
                   } else if (study.IsCriticalSequence && instance.KeyFramesList.length === 0) {
+                    // 兼容保存标记数据未存NumberOfFrames的情况，按序列展示
                     for (let i = 0; i < instance.NumberOfFrames; i++) {
                       const imageId = `wadouri:${localStorage.getItem('location') !== 'USA' ? Vue.prototype.OSSclientConfig.basePath : Vue.prototype.OSSclientConfig.basePath}${instance.Path}?frame=${i}&instanceId=${instance.Id}&visitTaskId=${obj.visitTaskId}&idx=${studyIndex}|${seriesIndex}|${index}`
                       imageIds.push(imageId)