diff --git a/requirements.txt b/requirements.txt
index 8a551b4..acbe8f6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,8 @@
-beautifulsoup4  # MIT
-oslo.log>=3.11.0  # Apache-2.0
-requests>=2.10.0,!=2.12.2,!=2.13.0  # Apache-2.0
-six>=1.9.0  # MIT
-PyYAML>=3.10.0  # MIT
+# 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.
+beautifulsoup4 # MIT
+oslo.log>=3.11.0 # Apache-2.0
+requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
+six>=1.9.0 # MIT
+PyYAML>=3.10.0 # MIT