diff --git a/Usage.md b/Usage.md
index 11ea6da..1ae025b 100644
--- a/Usage.md
+++ b/Usage.md
@@ -16,3 +16,6 @@ Settings for commands and subcommands in `default` group will be automatically a
 
 To assign CommandWhitelist group to a permission group, you need to grant `commandwhitelist.group.<group_name>`, where you substitute `<group_name>` with the name of the CommandWhitelist group.
 
+## Custom error message per group
+
+You can add `custom_command_denied_message` to each group. That will override the default command denied message for that group.
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