-the state of the route (``U'' if ``up''), whether the route
-is to a gateway (``G''), whether the route was created dynamically
-by a redirect (``D''), and whether the route has been modified
-by a redirect (``M''). Direct routes are created for each
+a collection of information about the route stored as
+binary choices. The individual flags are discussed in more
+detail in the
+.Xr route 8
+and
+.Xr route 4
+manual pages.
+The mapping between letters and flags is:
+.Bd -literal
+U RTF_UP Route useable
+G RTF_GATEWAY Destination requires forwarding by intermediary
+H RTF_HOST Host entry (net otherwise)
+R RTF_REJECT Host or net unreachable
+D RTF_DYNAMIC Created dynamically (by redirect)
+M RTF_MODIFIED Modified dynamically (by redirect)
+C RTF_CLONING Generate new routes on use
+X RTF_XRESOLVE External daemon translates proto to link address
+L RTF_LLINFO Valid protocol to link address translation.
+S RTF_STATIC Manually added
+B RTF_BLACKHOLE Just discard pkts (during updates)
+1 RTF_PROTO2 Protocol specific routing flag #1
+2 RTF_PROTO1 Protocol specific routing flag #2
+.Ed
+.Pp
+Direct routes are created for each