Index: generic/nsf.c
===================================================================
diff -u -r17ba2f1d86be4afd497d652b7ee39a5edc771a22 -re174b535c9d737520e28892f750311372f78bd7c
--- generic/nsf.c	(.../nsf.c)	(revision 17ba2f1d86be4afd497d652b7ee39a5edc771a22)
+++ generic/nsf.c	(.../nsf.c)	(revision e174b535c9d737520e28892f750311372f78bd7c)
@@ -14438,7 +14438,7 @@
 
     if (objc == 0 && ((pPtr->flags & NSF_ARG_ALLOW_EMPTY) == 0)) {
       return NsfPrintError(interp,
-			   "invalid parameter value for %s: list is not allowed to be empty",
+			   "invalid value for parameter '%s': list is not allowed to be empty",
 			   pPtr->name);
     }