Add note to intro page that getrandom() is new

diff --git a/man/3monocypher/intro.3monocypher b/man/3monocypher/intro.3monocypher
index a11aa304b91e30cb4452d067a91c2f9cf2d03b02..b6ed75e8a8507059f2806af1275a3699fc8aac99 100644 (file)
--- a/man/3monocypher/intro.3monocypher
+++ b/man/3monocypher/intro.3monocypher
@@ -18,7 +18,8 @@ They are easy to misuse, which has lead to countless vulnerabilities
 in the past, typically by repeating parts of the random stream.
 They typically require an external random seed anyway.
 .Pp
-On Linux, you can use the
+On recent versions of Linux (glibc >= 2.25, Linux >= 3.17), you can use
+the
 .Fn getrandom
 system call from
 .In linux/random.h .