diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..073d2a4
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,7 @@
+# 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.
+
+sphinx!=1.6.6,!=1.6.7,<2.0.0;python_version=='2.7'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4'  # BSD
+openstackdocstheme  # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index ca569aa..94c7246 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,6 +7,3 @@ doc8
 hacking>=1.1.0,<1.2.0 # Apache-2.0
 mock>=2.0
 requests-mock>=1.0
-sphinx!=1.6.6,!=1.6.7,<2.0.0;python_version=='2.7'  # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0;python_version>='3.4'  # BSD
-openstackdocstheme  # Apache-2.0
diff --git a/tox.ini b/tox.ini
index b5c7036..dd31147 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ commands =
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
-  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -b html doc/source doc/build/html