Document the syntax of this meta-object used by "list" and "flush"
commands only.

872f373dc50f7 ("doc: Add JSON schema documentation")

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 doc/libnftables-json.adoc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/libnftables-json.adoc b/doc/libnftables-json.adoc
index 643884d5c1063..049c3254ff03f 100644
--- a/doc/libnftables-json.adoc
+++ b/doc/libnftables-json.adoc
@@ -200,6 +200,18 @@ Rename a chain. The new name is expected in a dedicated property named
 
 == RULESET ELEMENTS
 
+=== RULESET
+[verse]
+____
+*{ "ruleset":* 'RULSET_PROPERTIES' *}*
+
+'RULESET_PROPERTIES' := *null* | *{ "family":* 'STRING' *}*
+____
+
+This is a special object for use with *list* and *flush* commands which will
+then operate on either the whole ruleset or the parts of it belonging to the
+given family.
+
 === TABLE
 [verse]
 ____
-- 
2.51.0