With the addition of the SHA512_256 family, there are five families, not 
four.

ok?

Index: /usr/src/lib/libc/hash/sha2.3
===================================================================
RCS file: /data/src/openbsd/src/lib/libc/hash/sha2.3,v
retrieving revision 1.26
diff -u -p -r1.26 sha2.3
--- /usr/src/lib/libc/hash/sha2.3       4 Sep 2016 09:28:12 -0000       1.26
+++ /usr/src/lib/libc/hash/sha2.3       11 Mar 2017 03:23:05 -0000
@@ -168,11 +168,12 @@ The SHA2 functions implement the NIST Se
 FIPS PUB 180-2.
 The SHA2 functions are used to generate a condensed representation of a
 message called a message digest, suitable for use as a digital signature.
-There are four families of functions, with names corresponding to
+There are five families of functions, with names corresponding to
 the number of bits in the resulting message digest.
 The SHA-224 and SHA-256 functions are limited to processing a message of less
 than 2^64 bits as input.
-The SHA-384 and SHA-512 functions can process a message of at most 2^128 - 1
+The SHA-384, SHA-512, and SHA-512/256 functions can process a message
+of at most 2^128 - 1
 bits as input.
 .Pp
 The SHA2 functions are considered to be more secure than the

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