diff --git a/src/View/PasswordQuickInput.ts b/src/View/PasswordQuickInput.ts
index 041fef45..2e4c7cab 100644
--- a/src/View/PasswordQuickInput.ts
+++ b/src/View/PasswordQuickInput.ts
@@ -16,7 +16,18 @@
 
 import * as vscode from 'vscode';
 
-// NOTE ASCII characters have codes ranging from u+0000 to u+007f
+// NOTE
+//
+//   u+0000-u+001f: control ascii codes,    ascii (ALLOWED)
+//   u+0020-u+007f: printable ascii codes,  ascii (ALLOWED)
+//   u+0080-u+00ff: extended ascii codes,   extended ascii (NOT ALLOWED)
+//
+// By experience, Linux os takes all extended ascii characters(u+0000-u+00ff) for passwords, even
+// controll asciis. whereas 'eslint' recommends not using regex including control ascii codes.
+// Therefore, we allow users to put control ascii codes.
+//
+// By experience, the passwords including extended ascii characters are not working when loging in
+// to remote vscode. Therefore, here we allow only 'ascii characters'(0x00-0x7f).
 function containsNonAscii(str: string): boolean {
   // eslint-disable-next-line no-control-regex
   return !/^[\u0000-\u007f]*$/.test(str);