diff --git a/SC2129.md b/SC2129.md
index 4756285..aaa259b 100644
--- a/SC2129.md
+++ b/SC2129.md
@@ -21,7 +21,7 @@ cat stuff  >> file
 
 ### Rationale:
 
-Rather than adding `>> something` after every single line, you can simply group the relevant commands and redirect the group.
+Rather than adding `>> something` after every single line, you can simply group the relevant commands and redirect the group. So the file has to be opened and closed only once and it means a performance gain.
 
 ### Exceptions: