https://git.ruby-lang.org/ruby.git/commit/?id=1dd10e1892

From 1dd10e189274546689c0b59f6a76849b2808f255 Mon Sep 17 00:00:00 2001
From: Chris AtLee <chris.atlee@s...>
Date: Tue, 9 Nov 2021 09:57:23 -0500
Subject: [DOC] Add documentation for Random.rand and Random.seed

---
 random.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/random.c b/random.c
index bf9479168bf..f3dec5cca20 100644
--- a/random.c
+++ b/random.c
@@ -1293,6 +1293,21 @@ random_s_bytes(VALUE obj, VALUE len) https://github.com/ruby/ruby/blob/trunk/random.c#L1293
     return rand_bytes(&random_mt_if, rnd, NUM2LONG(rb_to_int(len)));
 }
 
+/*
+ * call-seq: Random.seed -> integer
+ *
+ * Returns the seed value used to initialize the Ruby system PRNG.
+ * This may be used to initialize another generator with the same
+ * state at a later time, causing it to produce the same sequence of
+ * numbers.
+ *
+ *   Random.seed      #=> 1234
+ *   prng1 = Random.new(Random.seed)
+ *   prng1.seed       #=> 1234
+ *   prng1.rand(100)  #=> 47
+ *   Random.seed      #=> 1234
+ *   Random.rand(100) #=> 47
+ */
 static VALUE
 random_s_seed(VALUE obj)
 {
@@ -1646,10 +1661,10 @@ rb_f_rand(int argc, VALUE *argv, VALUE obj) https://github.com/ruby/ruby/blob/trunk/random.c#L1661
  *   Random.rand(max) -> number
  *   Random.rand(range) -> number
  *
- * Generates a random number by the default PRNG.
- * See Random#rand.
+ * Returns a random number using the Ruby system PRNG.
+ *
+ * See also Random#rand.
  */
-
 static VALUE
 random_s_rand(int argc, VALUE *argv, VALUE obj)
 {
-- 
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