-.\" $OpenBSD: ssh-keygen.1,v 1.66 2005/03/01 18:15:56 jmc Exp $
+.\" $OpenBSD: ssh-keygen.1,v 1.67 2005/03/14 10:09:03 dtucker Exp $
.\"
.\" -*- nroff -*-
.\"
.It Fl H
Hash a
.Pa known_hosts
-file, printing the result to standard output.
-This replaces all hostnames and addresses with hashed representations.
+file.
+This replaces all hostnames and addresses with hashed representations
+within the specified file; the original content is moved to a file with
+a .old suffix.
These hashes may be used normally by
.Nm ssh
and