Add documentation of TG_DEPTH for PL/pgSQL.

diff --git a/doc/src/sgml/plpgsql.sgml b/doc/src/sgml/plpgsql.sgml
index 527eaecc9b5908a545a53f3ddbb95f64bfd0b948..06da6366cfe49d6b99c9f12567dbd4ae9cad7585 100644 (file)
--- a/doc/src/sgml/plpgsql.sgml
+++ b/doc/src/sgml/plpgsql.sgml
@@ -3206,6 +3206,16 @@ RAISE unique_violation USING MESSAGE = 'Duplicate user ID: ' || user_id;
      </listitem>
     </varlistentry>
 
+    <varlistentry>
+     <term><varname>TG_DEPTH</varname></term>
+     <listitem>
+      <para>
+       Data type <type>integer</type>; the current number of levels of
+       nesting within trigger execution.
+      </para>
+     </listitem>
+    </varlistentry>
+
     <varlistentry>
      <term><varname>TG_NARGS</varname></term>
      <listitem>