in HISTORY, say where this actually came from;

ok deraadt@ bentley@

src/lib/libc/string/stpcpy.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: stpcpy.3,v 1.5 2013/09/25 21:50:18 millert Exp $
+.\"	$OpenBSD: stpcpy.3,v 1.6 2014/02/23 23:09:34 schwarze Exp $
 .\"
 .\" Copyright (c) 1990, 1991 The Regents of the University of California.
 .\" All rights reserved.
@@ -31,7 +31,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: September 25 2013 $
+.Dd $Mdocdate: February 23 2014 $
 .Dt STPCPY 3
 .Os
 .Sh NAME
@@ -174,9 +174,11 @@ and
 functions conform to
 .St -p1003.1-2008 .
 .Sh HISTORY
-The
+The function
 .Fn stpcpy
-and
+first appeared in the Lattice C AmigaDOS compiler (1986 or earlier).
+The function
 .Fn stpncpy
-functions first appeared in
+first appeared in the GNU C library version 1.07 (1993).
+Both functions have been available since
 .Ox 5.1 .