diff --git a/lib/codes.js b/lib/codes.js
index 66b3f07d..3cef8741 100644
--- a/lib/codes.js
+++ b/lib/codes.js
@@ -529,6 +529,10 @@ module.exports = {
         name: 'err_usersdontmatch',
         type: 'error'
     },
+    671: {
+        name: 'rpl_whoissecure',
+        type: 'reply'
+    },
     900: {
         name: 'rpl_loggedin',
         type: 'reply'