diff --git a/API-Publishers.md b/API-Publishers.md
index 5520d9e..2a3d24c 100644
--- a/API-Publishers.md
+++ b/API-Publishers.md
@@ -154,7 +154,8 @@ Expects a JSON publisher object \(see inserting an publisher\).
 #### Response
 
 **200** The publisher was successfully updated.  
-**400** `ID` is empty or no publisher with this `ID` exists. Returns a more specific message.  
+**400** Publisher payload is empty or not valid.  
+**404** No book with this `ID` exists.  
 **500** An error occured while updating.
 
 #### Example