diff --git a/README.md b/README.md
index f3a933b..84fbdfe 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ Here's an example:
 
 ```clojure
 (def open-validation-fsm
-  ^{:open? true}
+  ^{::rs/open? true}
   {:id      :validation-open
    :initial ::clean
    :states  {::clean   {:on {::edit-started ::editing}}
diff --git a/src/re_statecharts/core.cljc b/src/re_statecharts/core.cljc
index 15281f6..22a5077 100644
--- a/src/re_statecharts/core.cljc
+++ b/src/re_statecharts/core.cljc
@@ -117,9 +117,10 @@
 (defn integrate
   ([machine]
    (integrate machine sc.rf/default-opts))
-  ([{:keys [id] :as machine} {:keys [clock] :as opts}]
+  ([{:keys [id] :as machine}
+    {::keys [open?]
+     :keys  [clock] :as opts}]
    (let [clock           (or clock (clock/wall-clock))
-         open?           (:open? opts)
          machine         (assoc machine :scheduler (Scheduler. id (atom {}) clock open?))
          transition-opts (cond-> (:transition-opts opts)
                            open? (assoc :ignore-uknown-events? true))]