diff --git a/requirements.txt b/requirements.txt
index 18f626a..96a5232 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,10 @@
+# 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.
 cliff>=1.6.0
 jsonschema>=2.0.0,<3.0.0
 pbr>=0.6,!=0.7,<1.0
 python-keystoneclient>=0.10.0
-requests>=1.2.1
+requests>=1.2.1,!=2.4.0
 six>=1.7.0
 stevedore>=0.14
diff --git a/test-requirements.txt b/test-requirements.txt
index 691e2f5..9c850cd 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,3 +1,6 @@
+# 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 already pins down pep8, pyflakes and flake8
 hacking>=0.9.2,<0.10
 coverage>=3.6