diff --git a/networks.rkt b/networks.rkt
index d8842ff..20b84d9 100644
--- a/networks.rkt
+++ b/networks.rkt
@@ -15,7 +15,7 @@
    make-same-domains make-boolean-domains make-boolean-network
    make-01-domains make-01-network update
 
-   UpdateFunctionForm
+   UpdateFunctionForm (struct-out network-form) NetworkForm
    )
 
   (define-type (State a) (VariableMapping a))
@@ -118,6 +118,11 @@
                     #hash((x1 . #f) (x2 . #t)))))
 
   (define-type UpdateFunctionForm Any)
+
+  (struct (a) network-form ([forms : (VariableMapping UpdateFunctionForm)]
+                            [domains : (DomainMapping a)])
+    #:transparent
+    #:type-name NetworkForm)
   )
 
 (require 'typed)
@@ -132,11 +137,7 @@
  (contract-out [struct tbf/state ([weights (hash/c variable? number?)]
                                   [threshold number?])]
                [struct dynamics ([network network?]
-                                 [mode mode?])]
-               [struct network ([functions (hash/c variable? procedure?)]
-                                [domains domain-mapping/c])]
-               [struct network-form ([forms variable-mapping?]
-                                     [domains domain-mapping/c])])
+                                 [mode mode?])])
  ;; Functions
  (contract-out [update-function-form->update-function (-> update-function-form? update-function/c)]
                [network-form->network (-> network-form? network?)]
@@ -288,15 +289,6 @@
 
 (define update-function-form? any/c)
 
-;;; A network form consists of a mapping from variables to the forms
-;;; of their update functions, together with a mapping from its
-;;; variables to its update functions.
-;;;
-;;; The domain mapping does not have to assign domains to all
-;;; variables (e.g., it may be empty), but in this case the functions
-;;; which need to know the domains will not work.
-(struct network-form (forms domains) #:transparent)
-
 ;;; Build an update function from an update function form.
 (define (update-function-form->update-function form)
   (λ (s) (eval1-with s form)))
diff --git a/scribblings/networks.scrbl b/scribblings/networks.scrbl
index 8fe92f1..678fab0 100644
--- a/scribblings/networks.scrbl
+++ b/scribblings/networks.scrbl
@@ -208,6 +208,29 @@ and which can be evaluated with @racket[eval].
 
 }
 
+@defstruct*[network-form ([functions (VariableMapping NetworkForm)]
+			  [domains (DomainMapping a)])]{
+
+A network form consists of a mapping from variables to the forms of their
+update functions, together with a mapping from its variables to its
+update functions.
+
+The domain mapping does not have to assign domains to all variables (e.g., it
+may be empty), but in this case the functions which need to know the domains
+will not work.
+
+Instances of @racket[network-form] have the type @racket[NetworkForm].
+
+}
+
+@deftypeform[(NetworkForm a)]{
+
+The type of instances of @racket[network-form].
+
+@ex[
+(network-form (hash 'a '(and a b) 'b '(or a b))
+              (hash 'a '(#f #t) 'b '(#f #t)))
+]}
 
 @section{Inferring interaction graphs}