diff --git a/poky/documentation/genindex.rst b/poky/documentation/genindex.rst
index a4af06f..149e2d3 100644
--- a/poky/documentation/genindex.rst
+++ b/poky/documentation/genindex.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
 =====
 Index
 =====