poke: add --verbose option

Change-Id: I435f01cf6625bebbea40a0f808d8456fafb01fe1
diff --git a/manpages/ndnpoke.rst b/manpages/ndnpoke.rst
index f5ae345..7810a8c 100644
--- a/manpages/ndnpoke.rst
+++ b/manpages/ndnpoke.rst
@@ -4,7 +4,7 @@
 Synopsis
 --------
 
-**ndnpoke** [-h] [-f] [-F] [-x *freshness*] [-i *identity*\|\ -D] [-w *timeout*] [-V] *name*
+**ndnpoke** [-h] [-f] [-F] [-x *freshness*] [-i *identity*\|\ -D] [-w *timeout*] [-v] [-V] *name*
 
 Description
 -----------
@@ -38,6 +38,9 @@
 ``-w, --timeout <timeout>``
   Quit the program after ``timeout`` milliseconds, even if no Interest has been received.
 
+``-v, --verbose``
+  Turn on verbose output.
+
 ``-V, --version``
   Print version and exit.