diff --git a/scribblings/utils.scrbl b/scribblings/utils.scrbl
index de6a67c..1718815 100644
--- a/scribblings/utils.scrbl
+++ b/scribblings/utils.scrbl
@@ -498,3 +498,12 @@ Converts any non-@racket[#f] value to 1 and @racket[#f] to 0.
 (any->01 #f)
 (any->01 'hello)
 ]}
+
+@defproc[(01->boolean [x (U Zero One)]) Boolean]{
+
+Converts 0 to @racket[#f] and 1 to @racket[#t].
+
+@examples[#:eval utils-evaluator
+(01->boolean 0)
+(01->boolean 1)
+]}
diff --git a/utils.rkt b/utils.rkt
index 11eee5b..a0233bc 100644
--- a/utils.rkt
+++ b/utils.rkt
@@ -25,7 +25,8 @@
    update-vertices/unweighted update-graph dotit collect-by-key
    collect-by-key/sets ht-values/list->set hash->list/ordered
    multi-split-at lists-transpose in-random cartesian-product-2/stream
-   cartesian-product/stream boolean-power boolean-power/stream any->01)
+   cartesian-product/stream boolean-power boolean-power/stream any->01
+   01->boolean)
 
   (define-type Variable Symbol)
   (define-type (VariableMapping A) (Immutable-HashTable Variable A))
@@ -550,6 +551,15 @@
     (test-case "any->01"
       (check-equal? (any->01 #t) 1)
       (check-equal? (any->01 #f) 0)))
+
+  (: 01->boolean (-> (U Zero One) Boolean))
+  (define (01->boolean x)
+    (case x [(0) #f] [else #t]))
+
+  (module+ test
+    (test-case "01->boolean"
+      (check-equal? (01->boolean 0) #f)
+      (check-equal? (01->boolean 1) #t)))
   )
 
 (require 'typed)
@@ -561,13 +571,12 @@
          update-vertices/unweighted update-graph dotit collect-by-key
          collect-by-key/sets ht-values/list->set hash->list/ordered
          multi-split-at lists-transpose in-random cartesian-product-2/stream
-         cartesian-product/stream boolean-power boolean-power/stream any->01)
+         cartesian-product/stream boolean-power boolean-power/stream any->01
+         01->boolean)
 
 ;;; Untyped section.
 
 (provide
- ;; Functions
- (contract-out [01->boolean (-> (or/c 0 1) boolean?)])
  ;; Contracts
  (contract-out [variable-mapping? contract?]
                [string-variable-mapping? contract?]
@@ -586,18 +595,3 @@
 (define (general-pair/c key-contract val-contract)
   (or/c (list/c key-contract val-contract)
         (cons/c key-contract val-contract)))
-
-
-;;; ==================
-;;; Boolean operations
-;;; ==================
-
-
-;;; Converts 0 to #f and 1 to #t
-(define (01->boolean x)
-  (case x [(0) #f] [else #t]))
-
-(module+ test
-  (test-case "01->boolean"
-    (check-equal? (01->boolean 0) #f)
-    (check-equal? (01->boolean 1) #t)))