diff --git a/br/backup-and-restore-tool.md b/br/backup-and-restore-tool.md
index 9732139a13c81..6d305048e3a83 100644
--- a/br/backup-and-restore-tool.md
+++ b/br/backup-and-restore-tool.md
@@ -331,7 +331,7 @@ If you want to back up incrementally, you only need to specify the **last backup
 The incremental backup has two limitations:
 
 - The incremental backup needs to be under a different path from the previous full backup.
-- No GC (Garbage Collection) happens between the start time of the incremental backup and `lastbackupts`.
+- GC (Garbage Collection) safepoint must be before the `lastbackupts`.
 
 To back up the incremental data between `(LAST_BACKUP_TS, current PD timestamp]`, execute the following command: