diff --git a/requirements.txt b/requirements.txt
index 415555e..90e1ca5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,6 @@
+# Requirements lower bounds listed here are our best effort to keep them up to
+# date but we do not test them so no guarantee of having them all correct. If
+# you find any incorrect lower bounds, let us know or propose a fix.
+
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 psutil>=3.2.2 # BSD