From eca854041f86f2171e37ab876bf108d9e13b8188 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 27 Nov 2020 12:44:45 +0900
Subject: [DOC] Mersenne Twister isn't cryptographically secure [ci skip]

---
 random.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'random.c')

diff --git a/random.c b/random.c
index 1dd4ccd20f..d9a347e426 100644
--- a/random.c
+++ b/random.c
@@ -1672,7 +1672,8 @@ rb_reset_random_seed(void)
  * marshaled, allowing sequences to be saved and resumed.
  *
  * PRNGs are currently implemented as a modified Mersenne Twister with a period
- * of 2**19937-1.
+ * of 2**19937-1.  As this algorithm is _not_ for cryptographical use, you must
+ * use SecureRandom for security purpose, instead of this PRNG.
  */
 
 void
-- 
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