Mention that rfc6126-compatible is a noop in this version.
@@ -415,6 +415,9 @@ otherwise.
Only send TLVs that are defined by RFC 6126, the older version of Babel.
The default is
.BR false .
+This option does nothing in this version of
+.BR babeld ,
+it is provided for compatiblity with future versions.
.TP
.BI rtt\-decay " decay"
This specifies the decay factor for the exponential moving average of
