diff --git a/Vendor-Identifier-Codes.md b/Vendor-Identifier-Codes.md
index becd832..ce5573c 100644
--- a/Vendor-Identifier-Codes.md
+++ b/Vendor-Identifier-Codes.md
@@ -1,4 +1,4 @@
-To prevent different systems adopting the same vendor codes for the account number and preferences fields, this page is a list of all known and claimed vendor codes.
+To prevent different systems adopting the same vendor codes for the account number and preferences fields, this page is a list of all known and claimed vendor codes. When building a new system, please choose a code not already listed.
 
 Code | Owner | Notes
 -----|-------|------