diff --git a/lib/src/demo/ResourceDemo.gf b/lib/src/demo/ResourceDemo.gf
index 6e1f88b2d..d4ac7c53e 100644
--- a/lib/src/demo/ResourceDemo.gf
+++ b/lib/src/demo/ResourceDemo.gf
@@ -127,7 +127,7 @@ fun
    ConjS   : Conj -> S  -> S  -> S ;
    ConjAP  : Conj -> AP -> AP -> AP ;
    ConjNP  : Conj -> NP -> NP -> NP ;
-   a_Det, the_Det : Det ; 
+   a_Det, the_Det, aPl_Det, thePl_Det : Det ; 
    this_Det, these_Det : Det ;
    that_Det, those_Det : Det ;
    possDet : Pron -> Det ;
diff --git a/lib/src/demo/ResourceDemoEng.gf b/lib/src/demo/ResourceDemoEng.gf
index 052b69360..dd1367a4c 100644
--- a/lib/src/demo/ResourceDemoEng.gf
+++ b/lib/src/demo/ResourceDemoEng.gf
@@ -131,6 +131,8 @@ lin
    ConjNP co x y = mkNP co x y ;
    a_Det = mkDet a_Quant ;
    the_Det = mkDet the_Quant ;
+   aPl_Det = mkDet a_Quant plNum ;
+   thePl_Det = mkDet the_Quant plNum ;
    this_Det = S.this_Det ;
    these_Det = S.these_Det ;
    that_Det = S.that_Det ;