diff --git a/README b/README
index 0e2a383..de79fb2 100644
--- a/README
+++ b/README
@@ -4,3 +4,7 @@ automatically generated from the PCI ID Database at http://pci-ids.ucw.cz/.
 The contents of the database and the generated files can be distributed under
 the terms of either the GNU General Public License (version 2 or later) or of
 the 3-clause BSD License.
+
+The database is a compilation of factual data, and as such the copyright
+only covers the aggregation and formatting. The copyright is held by
+Martin Mares and Albert Pool.