diff --git a/br/br-pitr-guide.md b/br/br-pitr-guide.md
index fcfd35fe687a6..1268f69b5f2a0 100644
--- a/br/br-pitr-guide.md
+++ b/br/br-pitr-guide.md
@@ -105,8 +105,8 @@ The following steps describe how to clean up backup data that exceeds the backup
 
 ## Performance capabilities of PITR
 
-- On each TiKV node, PITR can restore snapshot data at a speed of 280 GB/h and log data 30 GB/h.
-- BR deletes outdated log backup data at a speed of 600 GB/h.
+- On each TiKV node, PITR can restore snapshot data (full restore) at a speed of 280 GB/h and log data (including meta files and KV files) at a speed of 30 GB/h.
+- BR deletes outdated log backup data (`tiup br log truncate`) at a speed of 600 GB/h.
 
 > **Note:**
 >