diff --git a/src/zulu/CatExtZul.gf b/src/zulu/CatExtZul.gf
index d4a02deb4..be268c330 100755
--- a/src/zulu/CatExtZul.gf
+++ b/src/zulu/CatExtZul.gf
@@ -11,5 +11,6 @@ concrete CatExtZul of CatExt = open ResZul,Prelude,ParamX in {
     -- INAdv = { s : Str ; postIAdv : Bool } ;
 
     Postdet = { s : Agr => Str } ;
+    SubCl = { s : Polarity => BasicTense => Str } ;
 
 }
diff --git a/src/zulu/abstract_ext/CatExt.gf b/src/zulu/abstract_ext/CatExt.gf
index 7a0e043a9..fa73b8a2c 100755
--- a/src/zulu/abstract_ext/CatExt.gf
+++ b/src/zulu/abstract_ext/CatExt.gf
@@ -11,5 +11,6 @@ abstract CatExt = {
     -- INAdv ; -- which/-phi?
 
     Postdet ;
+    SubCl ;
 
 }