diff --git a/app/src/main/java/net/micode/notes/tool/BackupUtils.java b/app/src/main/java/net/micode/notes/tool/BackupUtils.java
index a25a488..3ff1d0f 100644
--- a/app/src/main/java/net/micode/notes/tool/BackupUtils.java
+++ b/app/src/main/java/net/micode/notes/tool/BackupUtils.java
@@ -285,6 +285,7 @@ public class BackupUtils {
                             + "=0", null, null);
 
             if (noteCursor != null) {
+                //如果不为空
                 if (noteCursor.moveToFirst()) {
                     do {
                         ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
@@ -292,6 +293,7 @@ public class BackupUtils {
                                 noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
                         // Query data belong to this note
                         String noteId = noteCursor.getString(NOTE_COLUMN_ID);
+                        //通过id导出文本
                         exportNoteToText(noteId, ps);
                     } while (noteCursor.moveToNext());
                 }