+.It Cm RekeyLimit
+Specifies the maximum amount of data that may be transmitted before the
+session key will be renegotiated.
+The argument is the number of bytes, with an optional suffix of
+.Dq K ,
+.Dq M ,
+or
+.Dq G
+to indicate Kilobytes, Megabytes, or Gigabytes, respectively.
+The default is between
+.Dq 1G
+and
+.Dq 4G ,
+depending on the cipher.
+Note that this option applies to protocol version 2 only.