diff --git a/test-requirements.txt b/test-requirements.txt
index 4a234b1c42..bebf783337 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
 Jinja2
-doc8
+doc8  # Apache-2.0
 openstack-doc-tools>=0.18.1
 sphinx>=1.1.2,!=1.2.0,<1.3
 oslosphinx