diff --git a/Security-Overview.md b/Security-Overview.md
index 719be21..63fa4d6 100644
--- a/Security-Overview.md
+++ b/Security-Overview.md
@@ -24,13 +24,7 @@ All gRPC operations can optionally be secured via mutual TLS, by customizing the
 
 # Securing Volume Servers
 
-There are 2 ways to change volume servers: 
-1. Administrative operations via gRPC
-1. File upload, update, and delete operations.
-
-To control administrative operations, mutual TLS can be enabled for all gRPC calls.
-
-To control file upload/update/delete operations, Json Web Token (JWT) is used to authorize access for each file id.
+Besides gRPC mentioned above, volume servers can only be changed by file upload, update, and delete operations. Json Web Token (JWT) is used to authorize access for each file id.
 
 ## JWT-based access control
 To enable JWT-based access control,