diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 90c9e46a0d9..6767636e89d 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -879,6 +879,7 @@ en:
     min_password_length: "Minimum password length."
     block_common_passwords: "Don't allow passwords that are in the 10,000 most common passwords."
 
+    enable_sso: "Enable single sign on via an external site (WARNING: USERS' EMAIL ADDRESSES *MUST* BE VALIDATED BY THE EXTERNAL SITE!)"
     enable_sso_provider: "Implement Discourse SSO provider protocol at the /session/sso_provider endpoint, requires sso_secret to be set"
     sso_url: "URL of single sign on endpoint"
     sso_secret: "Secret string used to cryptographically authenticate SSO information, be sure it is 10 characters or longer"