diff --git a/scribblings/tbn.scrbl b/scribblings/tbn.scrbl
index 21ff8c6..464cb88 100644
--- a/scribblings/tbn.scrbl
+++ b/scribblings/tbn.scrbl
@@ -228,6 +228,23 @@ corresponds to the column giving the thresholds of the TBFs.
        (tbf/state (hash 'a -2 'b 1) 1)))
 ]}
 
+@defproc[(sbfs/state->lists [sbfs (Listof TBF/State)])
+			    (Listof (Listof Real))]{
+
+Like @racket[tbfs/state->lists], but the thresholds are omitted.
+
+@ex[
+(sbfs/state->lists (list (tbf/state (hash 'a 1 'b 2) 0)
+                         (tbf/state (hash 'a -2 'b 1) 0)))
+]
+
+Note that this function just drops the threshold, without checking
+whether it is actually 0:
+
+@ex[
+(sbfs/state->lists (list (tbf/state (hash 'a 1 'b 2) 3)))
+]}
+
 @section{Tabulating TBFs and SBFs}
 
 @defproc[(tabulate-tbfs/state [tbfs (Listof TBF/State)]) (Listof (Listof Real))]{
diff --git a/tbn.rkt b/tbn.rkt
index 52fa27e..3ea212d 100644
--- a/tbn.rkt
+++ b/tbn.rkt
@@ -29,6 +29,7 @@
    lists+vars->sbfs/state lists+headers->sbfs/state lists->sbfs/state
    read-org-tbfs/state read-org-tbfs/state+headers
    tbfs/state->lists tbfs/state->lists+headers
+   sbfs/state->lists
 
    tabulate-tbfs/state tabulate-tbfs/state+headers
    tabulate-tbf/state tabulate-tbf/state+headers
@@ -224,15 +225,14 @@
   (: sbfs/state->lists (-> (Listof TBF/State) (Listof (Listof Real))))
   (define (sbfs/state->lists tbfs)
     (for/list ([tbf (in-list tbfs)])
-      (append (hash-map (tbf/state-w tbf) (λ (_ [w : Real]) w) #t)
-              (list (tbf/state-θ tbf)))))
+      (hash-map (tbf/state-w tbf) (λ (_ [w : Real]) w) #t)))
 
   (module+ test
-    (test-case "tbfs/state->lists"
+    (test-case "sbfs/state->lists"
       (check-equal?
-       (tbfs/state->lists (list (tbf/state (hash 'a 1 'b 2) 3)
-                                   (tbf/state (hash 'a -2 'b 1) 1)))
-       '((1 2 3) (-2 1 1)))))
+       (sbfs/state->lists (list (tbf/state (hash 'a 1 'b 2) 0)
+                                (tbf/state (hash 'a -2 'b 1) 0)))
+       '((1 2) (-2 1)))))
 
   (: tabulate-tbfs/state (-> (Listof TBF/State) (Listof (Listof Real))))
   (define (tabulate-tbfs/state tbfs)