diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index ac351d3..20dfd1d 100644
*** a/doc/src/sgml/ref/psql-ref.sgml
--- b/doc/src/sgml/ref/psql-ref.sgml
*************** testdb=>
*** 991,997 ****
          objects.
          <quote>Object</quote> covers aggregates, functions, operators,
          types, relations (tables, views, indexes, sequences), large
!         objects, rules, and triggers. For example:
  <programlisting>
  =&gt; <userinput>\dd version</userinput>
                       Object descriptions
--- 991,997 ----
          objects.
          <quote>Object</quote> covers aggregates, functions, operators,
          types, relations (tables, views, indexes, sequences), large
!         objects, rules, triggers, and constraints. For example:
  <programlisting>
  =&gt; <userinput>\dd version</userinput>
                       Object descriptions
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e01fb7b..6da97e7 100644
*** a/src/bin/psql/describe.c
--- b/src/bin/psql/describe.c
*************** objectDescription(const char *pattern, b
*** 998,1003 ****
--- 998,1026 ----
  						  "n.nspname", "t.tgname", NULL,
  						  "pg_catalog.pg_table_is_visible(c.oid)");
  
+ 	/* Constraint descriptions */
+ 	appendPQExpBuffer(&buf,
+ 					  "UNION ALL\n"
+ 					  "  SELECT pgc.oid as oid, pgc.tableoid AS tableoid,\n"
+ 					  "  n.nspname as nspname,\n"
+ 					  "  CAST(pgc.conname AS pg_catalog.text) as name,"
+ 					  "  CAST('%s' AS pg_catalog.text) as object\n"
+ 					  "  FROM pg_catalog.pg_constraint pgc\n"
+ 					  "    JOIN pg_catalog.pg_class c "
+ 					  "ON c.oid = pgc.conrelid\n"
+ 					  "    LEFT JOIN pg_catalog.pg_namespace n "
+ 					  "    ON n.oid = c.relnamespace\n",
+ 					  gettext_noop("constraint"));
+ 
+ 	if (!showSystem && !pattern)
+ 		appendPQExpBuffer(&buf, "WHERE n.nspname <> 'pg_catalog'\n"
+ 						  "      AND n.nspname <> 'information_schema'\n");
+ 
+ 	/* XXX not sure what to do about visibility rule here? */
+ 	processSQLNamePattern(pset.db, &buf, pattern, !showSystem && !pattern, false,
+ 						  "n.nspname", "pgc.conname", NULL,
+ 						  "pg_catalog.pg_table_is_visible(c.oid)");
+ 
  	appendPQExpBuffer(&buf,
  					  ") AS tt\n"
  					  "  JOIN pg_catalog.pg_description d ON (tt.oid = d.objoid AND tt.tableoid = d.classoid AND d.objsubid = 0)\n");