diff --git a/poky/bitbake/lib/bblayers/__init__.py b/poky/bitbake/lib/bblayers/__init__.py
index 3ad9513..4e7c09d 100644
--- a/poky/bitbake/lib/bblayers/__init__.py
+++ b/poky/bitbake/lib/bblayers/__init__.py
@@ -1,2 +1,6 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)
diff --git a/poky/bitbake/lib/bblayers/action.py b/poky/bitbake/lib/bblayers/action.py
index a3f658f..d6459d6 100644
--- a/poky/bitbake/lib/bblayers/action.py
+++ b/poky/bitbake/lib/bblayers/action.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 import fnmatch
 import logging
 import os
diff --git a/poky/bitbake/lib/bblayers/common.py b/poky/bitbake/lib/bblayers/common.py
index 98515ce..c5657d3 100644
--- a/poky/bitbake/lib/bblayers/common.py
+++ b/poky/bitbake/lib/bblayers/common.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 import argparse
 import logging
 import os
diff --git a/poky/bitbake/lib/bblayers/layerindex.py b/poky/bitbake/lib/bblayers/layerindex.py
index b2ff226..57cd902 100644
--- a/poky/bitbake/lib/bblayers/layerindex.py
+++ b/poky/bitbake/lib/bblayers/layerindex.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 import layerindexlib
 
 import argparse
diff --git a/poky/bitbake/lib/bblayers/query.py b/poky/bitbake/lib/bblayers/query.py
index 9294dfa..993589d 100644
--- a/poky/bitbake/lib/bblayers/query.py
+++ b/poky/bitbake/lib/bblayers/query.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 import collections
 import fnmatch
 import logging