diff --git a/specification/appendix-a-included-utilities.md b/specification/appendix-a-included-utilities.md
index 26e987b5..269fe168 100644
--- a/specification/appendix-a-included-utilities.md
+++ b/specification/appendix-a-included-utilities.md
@@ -369,9 +369,9 @@ The logging hook is a hook which logs messages during the flag evaluation life-c
 
 | Stage   | Logged data                                                                                                                                   |
 | ------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
-| before  | `stage`, `domain`, `provider name`, `flag key`, `default value` and `evaluation context` (serialized, opt-in)                                 |
-| after   | `stage`, `domain`, `provider name`, `flag key`, `default value`, `evaluation context` (serialized, opt-in), `reason`, `variant` and `value`   |
-| error   | `stage`, `domain`, `provider name`, `flag key`, `default value`, `evaluation context` (serialized, opt-in), `error code`, and `error message` |
+| before  | `stage`, `domain`, `provider_name`, `flag_key`, `default_value` and `evaluation_context` (serialized, opt-in)                                 |
+| after   | `stage`, `domain`, `provider_name`, `flag_key`, `default_value`, `evaluation_context` (serialized, opt-in), `reason`, `variant` and `value`   |
+| error   | `stage`, `domain`, `provider_name`, `flag_key`, `default_value`, `evaluation_context` (serialized, opt-in), `error code`, and `error_message` |
 | finally | N/A                                                                                                                                           |
 
 > The evaluation context **SHOULD** only be logged if an associated option indicates so.