diff --git a/test-requirements.txt b/test-requirements.txt
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+# 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>=0.12.0,<0.13 # Apache-2.0
+
+sphinx>=1.6.2 # BSD
+openstackdocstheme>=1.11.0  # Apache-2.0
+# releasenotes
+reno>=1.8.0 # Apache-2.0