diff --git a/networks.rkt b/networks.rkt
index 20b84d9..2c796d7 100644
--- a/networks.rkt
+++ b/networks.rkt
@@ -16,6 +16,7 @@
    make-01-domains make-01-network update
 
    UpdateFunctionForm (struct-out network-form) NetworkForm
+   update-function-form->update-function
    )
 
   (define-type (State a) (VariableMapping a))
@@ -123,6 +124,16 @@
                             [domains : (DomainMapping a)])
     #:transparent
     #:type-name NetworkForm)
+
+  (: update-function-form->update-function (-> UpdateFunctionForm (UpdateFunction Any)))
+  (define (update-function-form->update-function form)
+    (λ (s) (eval1-with s form)))
+
+  (module+ test
+    (test-case "update-function-form->update-function"
+      (define s (hash 'x #t 'y #f))
+      (define f (update-function-form->update-function '(and x y)))
+      (check-equal? (f s) #f)))
   )
 
 (require 'typed)
@@ -139,8 +150,7 @@
                [struct dynamics ([network network?]
                                  [mode mode?])])
  ;; Functions
- (contract-out [update-function-form->update-function (-> update-function-form? update-function/c)]
-               [network-form->network (-> network-form? network?)]
+ (contract-out [network-form->network (-> network-form? network?)]
                [make-boolean-network-form (-> variable-mapping? network-form?)]
                [forms->boolean-network (-> variable-mapping? network?)]
                [list-syntactic-interactions (-> network-form? variable? (listof variable?))]
@@ -289,16 +299,6 @@
 
 (define update-function-form? any/c)
 
-;;; Build an update function from an update function form.
-(define (update-function-form->update-function form)
-  (λ (s) (eval1-with s form)))
-
-(module+ test
-  (test-case "update-function-form->update-function"
-    (define s (hash 'x #t 'y #f))
-    (define f (update-function-form->update-function '(and x y)))
-    (check-equal? (f s) #f)))
-
 ;;; Build a network from a network form.
 (define (network-form->network nf)
   (network
diff --git a/scribblings/networks.scrbl b/scribblings/networks.scrbl
index 678fab0..14ab119 100644
--- a/scribblings/networks.scrbl
+++ b/scribblings/networks.scrbl
@@ -232,6 +232,20 @@ The type of instances of @racket[network-form].
               (hash 'a '(#f #t) 'b '(#f #t)))
 ]}
 
+@defproc[(update-function-form->update-function [func UpdateFunctionForm])
+						(UpdateFunction Any)]{
+
+Builds an update function from an update function form.
+
+@ex[
+(define and-from-form (update-function-form->update-function '(and x y)))
+(and-from-form (hash 'x #f 'y #f))
+(and-from-form (hash 'x #f 'y #t))
+(and-from-form (hash 'x #t 'y #f))
+(and-from-form (hash 'x #t 'y #t))
+]}
+
+
 @section{Inferring interaction graphs}
 
 This section provides inference of both unsigned and signed interaction graphs.