diff --git a/requirements.txt b/requirements.txt
index 84764d7e..529dd8c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,7 @@
+# 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
 python-ironicclient!=2.5.2,!=2.7.1,>=2.3.0 # Apache-2.0
 horizon>=17.1.0  # Apache-2.0