diff --git a/frontend/src/app/util/array.cljs b/frontend/src/app/util/array.cljs
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+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; This Source Code Form is "Incompatible With Secondary Licenses", as
+;; defined by the Mozilla Public License, v. 2.0.
+;;
+;; Copyright (c) 2020 UXBOX Labs SL
+
+(ns app.util.array
+  "A collection of helpers for work with javascript arrays."
+  (:refer-clojure :exclude [conj!]))
+
+(defn conj!
+  "A conj like function for js arrays."
+  [a v]
+  (.push ^js a v)
+  a)