diff --git a/Performance-tuning.md b/Performance-tuning.md
index af6f171..9a045b7 100644
--- a/Performance-tuning.md
+++ b/Performance-tuning.md
@@ -12,7 +12,7 @@ Recommendations: TODO
 
 ### type
 
-`type = multifilesystem_nolock` turns from using lock mechanism on OS/FS level to be handled internally by "radicale"
+`type = multifilesystem_nolock` turns from using lock mechanism on operating system / file system level to be handled internally by "radicale"
 
 ### max_sync_token_age