diff --git a/paramiko/client.py b/paramiko/client.py
index 4fa28e5..493d548 100644
--- a/paramiko/client.py
+++ b/paramiko/client.py
@@ -193,7 +193,6 @@ class SSHClient (object):
             self.load_host_keys(self.known_hosts)
 
         f = open(filename, 'w')
-        f.write('# SSH host keys collected by paramiko\n')
         for hostname, keys in self._host_keys.iteritems():
             for keytype, key in keys.iteritems():
                 f.write('%s %s %s\n' % (hostname, keytype, key.get_base64()))