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diff --git a/doc/database/db_clients.md b/doc/database/db_clients.md
index 228b45cc21..a97e796edd 100644
--- a/doc/database/db_clients.md
+++ b/doc/database/db_clients.md
@@ -1,13 +1,33 @@
 Table clients
-=============
-
-| Field         | Description | Type         | Null | Key | Default | Extra |
-| ------------- | ----------- | ------------ | ---- | --- | ------- | ----- |
-| client_id     |             | varchar(20)  | NO   | PRI | NULL    |       |
-| pw            |             | varchar(20)  | NO   |     |         |       |
-| redirect_uri  |             | varchar(200) | NO   |     |         |       |
-| name          |             | text         | YES  |     | NULL    |       |
-| icon          |             | text         | YES  |     | NULL    |       |
-| uid           |             | int(11)      | NO   |     | 0       |       |
+===========
+
+OAuth usage
+
+Fields
+------
+
+| Field        | Description | Type               | Null | Key | Default | Extra |
+| ------------ | ----------- | ------------------ | ---- | --- | ------- | ----- |
+| client_id    |             | varchar(20)        | NO   | PRI | NULL    |       |
+| pw           |             | varchar(20)        | NO   |     |         |       |
+| redirect_uri |             | varchar(200)       | NO   |     |         |       |
+| name         |             | text               | YES  |     | NULL    |       |
+| icon         |             | text               | YES  |     | NULL    |       |
+| uid          | User id     | mediumint unsigned | NO   |     | 0       |       |
+
+Indexes
+------------
+
+| Name    | Fields    |
+| ------- | --------- |
+| PRIMARY | client_id |
+| uid     | uid       |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uid | [user](help/database/db_user) | uid |
 
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