diff --git a/d2layouts/d2dagrelayout/NOTICE.txt b/d2layouts/d2dagrelayout/NOTICE.txt
new file mode 100644
index 000000000..cac5f33be
--- /dev/null
+++ b/d2layouts/d2dagrelayout/NOTICE.txt
@@ -0,0 +1,6 @@
+dagre.js comes from https://github.com/dagrejs/dagre
+
+Attribution:
+
+MIT License
+https://github.com/dagrejs/dagre/blob/master/LICENSE
diff --git a/d2layouts/d2elklayout/NOTICE.txt b/d2layouts/d2elklayout/NOTICE.txt
new file mode 100644
index 000000000..6fdaba655
--- /dev/null
+++ b/d2layouts/d2elklayout/NOTICE.txt
@@ -0,0 +1,6 @@
+elk.js comes from https://github.com/kieler/elkjs
+
+Attribution:
+
+EPL License 2.0
+https://github.com/kieler/elkjs/blob/master/LICENSE.md