diff --git a/doc/source/index.rst b/doc/source/index.rst
index a6210d3..17585e2 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -1 +1,8 @@
 .. include:: ../../README.rst
+
+
+.. warning:: Ironic is heavily tied to microversion.
+             Therefore to use this salt formulas, please take a look at
+             Ironic api-ref. Take a look at each endpoint and param you want
+             to use, and find suitable microversion.
+             `https://developer.openstack.org/api-ref/baremetal/`_
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