diff --git a/README.md b/README.md
index a526ce9..c9c2da4 100644
--- a/README.md
+++ b/README.md
@@ -30,3 +30,15 @@ current state of the door lock.
 The authors of the Arduino code license the code under the AGPL 3.0 (see
 `LICENSE.AGPL`). The respective authors are listed in the in the preambles of
 each source file.
+
+## Dependencies
+
+The Arduino code depends on the following libraries:
+
+_Arduino Core_ published by the copyright holders under the LGPL 2.1 or later.
+
+_SPI Master Library for Arduino Zero_ published by the copyright holders under
+the LGPL 2.1 or later.
+
+_Library for Arduino WiFi Shield_ published by the copyright holders under the
+LGPL 2.1 or later.