diff --git a/test-requirements.txt b/test-requirements.txt
index 1215da8..a1259f3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,10 +1,13 @@
+# 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.
 coverage>=3.6
 discover
 fixtures>=0.3.14
 flake8==2.2.3
 mock>=1.0
 python-subunit>=0.0.18
-oslosphinx>=2.2.0.0a2
+oslosphinx>=2.2.0  # Apache-2.0
 sphinx>=1.1.2,!=1.2.0,<1.3
 testrepository>=0.0.18
 testresources>=0.2.4