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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -109,6 +109,13 @@ Using unattended\_upgrades simply consists of including the module and if needed
   }
   ```
 * `verbose` (`0`): Send report mail to root.
+* `options` (`{}`): A hash of settings with these possible keys:
+  * `force_confdef` (`true`) : Use the default option for new config files if one 
+    is available, don't prompt. If no default can be found, you will be prompted 
+    unless one of the confold or confnew options is also given
+  * `force_confold` (`true`): Always use the old config files, don't prompt
+  * `force_connew` (`false`): Always use the new config files, don't prompt
+  * `force_conmiss` (`false`): Always install missing config files
 
 ## Limitations