doc: Update `show ip mroute` command docs.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

diff --git a/doc/user/pim.rst b/doc/user/pim.rst
index 17bf44fdbac5119656bbfcd255d029f8f9c90eff..e385df3b6d37e57fe4bb43b464c1cd842915880e 100644 (file)
--- a/doc/user/pim.rst
+++ b/doc/user/pim.rst
@@ -293,10 +293,14 @@ cause great confusion.
 
    Display various information about the interfaces used in this pim instance.
 
-.. index:: show ip mroute
-.. clicmd:: show ip mroute
-
-   Display information about installed into the kernel S,G mroutes.
+.. index:: show ip mroute [vrf NAME] [A.B.C.D [A.B.C.D]] [fill] [json]
+.. clicmd:: show ip mroute [vrf NAME] [A.B.C.D [A.B.C.D]] [fill] [json]
+
+   Display information about installed into the kernel S,G mroutes.  If
+   one address is specified we assume it is the Group we are interested
+   in displaying data on.  If the second address is specified then it is
+   Source Group.  The keyword `fill` says to fill in all assumed data
+   for test/data gathering purposes.
 
 .. index:: show ip mroute count
 .. clicmd:: show ip mroute count