doc: add initial nhrpd documentation
diff --git a/doc/zebra.8 b/doc/zebra.8
index a40909a..6f70389 100644
--- a/doc/zebra.8
+++ b/doc/zebra.8
@@ -119,6 +119,7 @@
 .BR ospfd (8),
 .BR ospf6d (8),
 .BR isisd (8),
+.BR nhrpd (8),
 .BR vtysh (1)
 .SH BUGS
 .B zebra