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diff --git a/doc/random_numbers.rst b/doc/random_numbers.rst
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+==============
+Random numbers
+==============
+
+Function overview
+=================
+
+.. code-block:: c
+
+	#include <libHX/misc.h>
+
+	int HX_rand(void);
+	unsigned int HX_irand(unsigned int min, unsigned int max);
+	double HX_drand(double min, double max);
+
+``HX_rand``
+	Retrieve the next random number.
+
+``HX_irand``
+	Retrieve the next random number and fold it such that *min <= n < max*.
+
+``HX_drand``
+	Retrieve the next random number and fold it such that *min <= n < max*.
+
+Implementation information
+==========================
+
+``/dev/urandom`` will be used to seed the libc-level number generator.
+
+``/dev/random`` is not used on Linux because it may block during read, and
+/dev/urandom is just as good when there is entropy available. If you need
+definitive PRNG security, perhaps use one from a crypto suite such as OpenSSL.