diff --git a/requirements-py3.txt b/requirements-py3.txt
index ab76b4aab..e07409566 100644
--- a/requirements-py3.txt
+++ b/requirements-py3.txt
@@ -18,4 +18,4 @@ PyYAML>=3.1.0
 kombu>=2.5.0
 
 # middleware
-oslo.middleware>=0.1.0
+oslo.middleware>=0.1.0                  # Apache-2.0
diff --git a/requirements.txt b/requirements.txt
index 29e4b89b7..3f80258d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,4 +25,4 @@ PyYAML>=3.1.0
 kombu>=2.5.0
 
 # middleware
-oslo.middleware>=0.1.0
+oslo.middleware>=0.1.0                  # Apache-2.0