diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 4da6719ce7..8702e52e4d 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -4188,6 +4188,10 @@ listSchemas(const char *pattern, bool verbose, bool showSystem)
 	{
 		appendPQExpBufferStr(&buf, ",\n  ");
 		printACLColumn(&buf, "n.nspacl");
+		appendPQExpBuffer(&buf,
+						  ",\n  ((SELECT pg_catalog.pg_size_pretty((sum(pg_catalog.pg_relation_size(c.oid)))::bigint) FROM pg_catalog.pg_class c\n    LEFT JOIN pg_catalog.pg_namespace s ON s.oid = c.relnamespace WHERE s.nspname = n.nspname)) as \"%s\"",
+						  gettext_noop("Size"));
+
 		appendPQExpBuffer(&buf,
 						  ",\n  pg_catalog.obj_description(n.oid, 'pg_namespace') AS \"%s\"",
 						  gettext_noop("Description"));