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diff --git a/doc/database/db_intro.md b/doc/database/db_intro.md
index 698fbe9189..426d8579dd 100644
--- a/doc/database/db_intro.md
+++ b/doc/database/db_intro.md
@@ -2,18 +2,39 @@ Table intro
 ===========
 
 
-| Field | Description | Type | Null | Key | Default | Extra |
-| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| id         | sequential ID | int unsigned       | NO  | PRI | NULL                | auto_increment |    
-| uid        | User id       | mediumint unsigned | NO  |     | 0                   |                |    
-| fid        |               | int unsigned       | YES |     | NULL                |                |    
-| contact-id |               | int unsigned       | NO  |     | 0                   |                |    
-| knowyou    |               | boolean            | NO  |     | 0                   |                |    
-| duplex     |               | boolean            | NO  |     | 0                   |                |    
-| note       |               | text               | YES |     | NULL                |                |    
-| hash       |               | varchar(255)       | NO  |     |                     |                |    
-| datetime   |               | datetime           | NO  |     | 0001-01-01 00:00:00 |                |    
-| blocked    |               | boolean            | NO  |     | 1                   |                |    
-| ignore     |               | boolean            | NO  |     | 0                   |                |    
+
+Fields
+------
+
+| Field      | Description   | Type               | Null | Key | Default             | Extra          |
+| ---------- | ------------- | ------------------ | ---- | --- | ------------------- | -------------- |
+| id         | sequential ID | int unsigned       | NO   | PRI | NULL                | auto_increment |
+| uid        | User id       | mediumint unsigned | NO   |     | 0                   |                |
+| fid        |               | int unsigned       | YES  |     | NULL                |                |
+| contact-id |               | int unsigned       | NO   |     | 0                   |                |
+| knowyou    |               | boolean            | NO   |     | 0                   |                |
+| duplex     |               | boolean            | NO   |     | 0                   |                |
+| note       |               | text               | YES  |     | NULL                |                |
+| hash       |               | varchar(255)       | NO   |     |                     |                |
+| datetime   |               | datetime           | NO   |     | 0001-01-01 00:00:00 |                |
+| blocked    |               | boolean            | NO   |     | 1                   |                |
+| ignore     |               | boolean            | NO   |     | 0                   |                |
+
+Indexes
+------------
+
+| Name       | Fields     |
+| ---------- | ---------- |
+| PRIMARY    | id         |
+| contact-id | contact-id |
+| uid        | uid        |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uid | [user](help/database/db_user) | uid |
+| contact-id | [contact](help/database/db_contact) | id |
 
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