diff --git a/requirements.txt b/requirements.txt
index b25096e..2c69f5e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,5 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
 Babel>=1.3
 six>=1.7.0
diff --git a/test-requirements.txt b/test-requirements.txt
index a4acbb6..7a1fcc1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,9 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
 hacking>=0.9.2,<0.10
 
 sphinx>=1.1.2,!=1.2.0,<1.3
-oslosphinx>=2.2.0.0a2
+oslosphinx>=2.2.0  # Apache-2.0
 
-oslotest>=1.1.0.0a1
+oslotest>=1.1.0  # Apache-2.0