diff --git a/doc/api/index.rst b/doc/api/index.rst
index fd3b5bd..b7eb572 100644
--- a/doc/api/index.rst
+++ b/doc/api/index.rst
@@ -9,5 +9,6 @@
    dfu
    efi
    linker_lists
+   rng
    serial
    unicode
diff --git a/doc/api/rng.rst b/doc/api/rng.rst
new file mode 100644
index 0000000..b826d4f
--- /dev/null
+++ b/doc/api/rng.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. Copyright (c) 2018 Heinrich Schuchardt
+
+Random number generation
+========================
+
+Hardware random number generation
+---------------------------------
+
+.. kernel-doc:: include/rng.h
+   :internal:
+
+Pseudo random number generation
+-------------------------------
+
+.. kernel-doc:: include/rand.h
+   :internal: