diff --git a/README.md b/README.md
index e621bf685..5dcc58d5f 100644
--- a/README.md
+++ b/README.md
@@ -51,11 +51,22 @@ previous stable release.
 
 ### Foreman version compatibility notes
 
-For Foreman 1.16 or older, please use the 9.x release series of this module.
 The parameters `locations_enabled`, `organizations_enabled` and `authentication`
 will only have any affect on Foreman 1.20 or older, in newer versions these
 settings have been removed.
 
+**Warning** Users configuring Foreman 1.20 and earlier will need to pay
+particular attention. Some defaults have been flipped, including all user
+authentication.
+
+| Setting                    | module 11.x with 1.20 | module 10.x with 1.20 |
+|----------------------------|-----------------------|-----------------------|
+| `authentication` (`login`) | false                 | true                  |
+| `locations_enabled`        | true                  | false                 |
+| `organizations_enabled `   | true                  | false                 |
+
+For Foreman 1.16 or older, please use the 9.x release series of this module.
+
 ## Types and providers
 
 `foreman_config_entry` can be used to manage settings in Foreman's database, as