diff --git a/src/datomish/query.cljc b/src/datomish/query.cljc
index da8823d2..2efbd39f 100644
--- a/src/datomish/query.cljc
+++ b/src/datomish/query.cljc
@@ -1,3 +1,7 @@
+;; 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/.
+
 (ns datomish.query
   (:require
      [datomish.util :as util :refer [raise var->sql-var]]
diff --git a/src/datomish/transforms.cljc b/src/datomish/transforms.cljc
index 95525c5c..3b48ae5b 100644
--- a/src/datomish/transforms.cljc
+++ b/src/datomish/transforms.cljc
@@ -1,3 +1,7 @@
+;; 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/.
+
 (ns datomish.transforms)
 
 #?(:clj
diff --git a/src/datomish/util.cljc b/src/datomish/util.cljc
index 0d5d7029..779408ab 100644
--- a/src/datomish/util.cljc
+++ b/src/datomish/util.cljc
@@ -1,3 +1,7 @@
+;; 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/.
+
 (ns datomish.util
   (:require
      [clojure.string :as str]))