diff --git a/web/static/js/source-validator.v1.js b/web/static/js/source-validator.v1.js
index f647cf4..628e029 100644
--- a/web/static/js/source-validator.v1.js
+++ b/web/static/js/source-validator.v1.js
@@ -11,7 +11,7 @@ window.SourceValidator = (function () {
     "wp","ws","yb","mwb","w","g","ap","apf","be","bh","br","bt","btg","cf","cl","ct","dp",
     "fg","fy","gt","hb","im","ip","it","jv","ka","kj","kl","lf","lff","ll","ly","my","od",
     "pe","po","pt","rr","rs","sg","sh","si","td","tp","tr","ts","un","jy",
-    "uw","su","re","lvs","lp" // new
+    "uw","su","re","lvs","lp","yy"// new
   ];
 
   // Year validation rules (applies only if a year can be parsed from the source).