diff --git a/API-Record-Credentials.md b/API-Record-Credentials.md
index 9562515..bced309 100644
--- a/API-Record-Credentials.md
+++ b/API-Record-Credentials.md
@@ -46,6 +46,7 @@
 | code | result |
 | --- | --- |
 | 201 | Everything was successful, domain has been created |
+| 400 | Either type is not valid, or key is not a valid public key |
 | 422 | One of the required fields is missing, or key is invalid |
 
 ```json