tweaks

README

@@ -2,7 +2,7 @@ echoc is a small network test program that sends UDP packets to the
 echo service (it should be activated in [x]inetd on the target host).
 echoc displays the start/end date of loss of connectivity.
 
-It's distributed under the ISC license:
+It is distributed under the ISC license:
 
 /*
  * Copyright (c) 2012 Matthieu Herrb <matthieu@herrb.eu>

echoc.1

@@ -21,7 +21,9 @@ sends UDP packets to the
 .Dv ECHO
 service on the remote 
 .Ar host .
-The options ar as follow:
+.Nm 
+displays the start/end date of loss of connectivity.
+The options are as follow:
 .Bl -tag -width Ds
 .It Fl c Ar count
 Stop sending after
@@ -30,10 +32,13 @@ packets have been sent.
 .It Fl d
 Set the 
 .Dv Don't Fragment
-bit.
+bit on outgoing datagrams, on systems that allow programs to control it.
+On some systems (MacOSX, OpenBSD) this option will do nothing and the
+generated datagrams will have the DF bit set or not, depending on
+system settings.
 .It Fl i Ar ms
 wait
-.Ar i
+.Ar ms
 milliseconds between every packet (default: 100 ms).
 .It Fl l Ar len
 Send packets of length
@@ -45,8 +50,9 @@ Set destination port to
 (default: 7 - echo).
 .It Fl t Ar ms
 Wait at most
-.Ar t
-milliseconds for the reply before declaring the connection dead.
+.Ar ms
+milliseconds for the reply before declaring the connection dead
+(default: 500ms).
 .El
 .Sh SEE ALSO
 .Xr nc 1 ,