Index: head/lib/libc/gen/arc4random.3
===================================================================
--- head/lib/libc/gen/arc4random.3
+++ head/lib/libc/gen/arc4random.3
@@ -31,7 +31,7 @@
 .\" Manual page, using -mandoc macros
 .\" $FreeBSD$
 .\"
-.Dd March 21, 2019
+.Dd April 10, 2020
 .Dt ARC4RANDOM 3
 .Os
 .Sh NAME
@@ -121,6 +121,13 @@
 .Xr rand 3 ,
 .Xr rand48 3 ,
 .Xr random 3
+.Rs
+.%A Daniel J. Bernstein
+.%T ChaCha, a variant of Salsa20
+.%D 2008-01-28
+.%O Document ID: 4027b5256e17b9796842e6d0f68b0b5e
+.%U http://cr.yp.to/papers.html#chacha
+.Re
 .Sh HISTORY
 These functions first appeared in
 .Ox 2.1 .