From b52a2170d13fe7ff6e4e3b146b63d8f68c2aaadf Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Mon, 28 Mar 2011 16:38:57 +0200
Subject: Improve algorithm in module random.

Avoid seed values that are even divisors of the primes
and by that prevent getting seeds that are stuck on zero.

Example: random:seed(0,0,0) would produce a series of only zeros.
---
 lib/stdlib/doc/src/random.xml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'lib/stdlib/doc/src/random.xml')

diff --git a/lib/stdlib/doc/src/random.xml b/lib/stdlib/doc/src/random.xml
index dcc6d756e1..26f22db48e 100644
--- a/lib/stdlib/doc/src/random.xml
+++ b/lib/stdlib/doc/src/random.xml
@@ -4,7 +4,7 @@
 <erlref>
   <header>
     <copyright>
-      <year>1996</year><year>2009</year>
+      <year>1996</year><year>2011</year>
       <holder>Ericsson AB. All Rights Reserved.</holder>
     </copyright>
     <legalnotice>
@@ -146,6 +146,11 @@
       <c>random_seed</c> to remember the current seed.</p>
     <p>If a process calls <c>uniform/0</c> or <c>uniform/1</c> without
       setting a seed first, <c>seed/0</c> is called automatically.</p>
+    <p>The implementation changed in R15. Upgrading to R15 will break
+      applications that expect a specific output for a given seed. The output
+      is still deterministic number series, but different compared to releases
+      older than R15. The seed <c>{0,0,0}</c> will for example no longer
+      produce a flawed series of only zeros.</p>
   </section>
 </erlref>
 
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