diff --git a/doc/04-schema.md b/doc/04-schema.md
index c338b4673..f3d85e742 100644
--- a/doc/04-schema.md
+++ b/doc/04-schema.md
@@ -145,10 +145,10 @@ The recommended notation for the most common licenses is (alphabetical):
 - BSD-2-Clause
 - BSD-3-Clause
 - BSD-4-Clause
-- GPL-2.0
-- GPL-3.0
-- LGPL-2.1
-- LGPL-3.0
+- GPL-2.0-only / GPL-2.0-or-later
+- GPL-3.0-only / GPL-3.0-or-later
+- LGPL-2.1-only / LGPL-2.1-or-later
+- LGPL-3.0-only / LGPL-3.0-or-later
 - MIT
 
 Optional, but it is highly recommended to supply this. More identifiers are