diff --git a/br/br-pitr-guide.md b/br/br-pitr-guide.md
index 6250c7c4421a9..707f4815e4df8 100644
--- a/br/br-pitr-guide.md
+++ b/br/br-pitr-guide.md
@@ -104,8 +104,8 @@ 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-- BR deletes outdated log backup data at a speed of 600 GB/h.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+- BR deletes outdated log backup data (`tiup br log truncate`) at a speed of 600 GB/h.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:**
 >