diff --git a/api-documentation.md b/api-documentation.md
index 041968d..c2dea64 100644
--- a/api-documentation.md
+++ b/api-documentation.md
@@ -403,7 +403,7 @@ A json object for the specified meeting with an array of `participant`.
 | :------------ | :-------- | :-------------------------- |
 | id            | int       | primary key, auto-increment |
 | meeting_id    | varchar   | foreign key, required       |
-| possible_date | date      | foreign key, required       |
+| possible_date | date      | required                    |
 
 #### Add a possible date
 
@@ -466,7 +466,8 @@ A json object for the deleted possible date with `id`, `meeting_id` and `possibl
 
 | field         | data type | metadata                    |
 | :------------ | :-------- | :-------------------------- |
-| account_id    | int       | primary key, auto-increment |
+| id            | int       | primary key, auto-increment |
+| account_id    | varchar   | required                    |
 | meeting_id    | varchar   | required                    |
 | earliest_time | datetime  |                             |
 | latest_time   | datetime  |                             |