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diff --git a/doc/database/db_group.md b/doc/database/db_group.md
index f4f60436cd..ad7fa4a3dd 100644
--- a/doc/database/db_group.md
+++ b/doc/database/db_group.md
@@ -1,13 +1,35 @@
 Table group
 ===========
+
 privacy groups, group info
 
-| Field | Description | Type | Null | Key | Default | Extra |
-| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| id | sequential ID | int unsigned | YES | PRI |  | auto_increment |    
-| uid | Owner User id | mediumint unsigned | YES |  | 0 |  |    
-| visible | 1 indicates the member list is not private | boolean | YES |  | 0 |  |    
-| deleted | 1 indicates the group has been deleted | boolean | YES |  | 0 |  |    
-| name | human readable name of group | varchar(255) | YES |  |  |  |    
+Fields
+------
+
+| Field   | Description                                                                               | Type               | Null | Key | Default | Extra          |
+| ------- | ----------------------------------------------------------------------------------------- | ------------------ | ---- | --- | ------- | -------------- |
+| id      | sequential ID                                                                             | int unsigned       | NO   | PRI | NULL    | auto_increment |
+| uid     | Owner User id                                                                             | mediumint unsigned | NO   |     | 0       |                |
+| visible | 1 indicates the member list is not private                                                | boolean            | NO   |     | 0       |                |
+| deleted | 1 indicates the group has been deleted                                                    | boolean            | NO   |     | 0       |                |
+| cid     | Contact id of forum. When this field is filled then the members are synced automatically. | int unsigned       | YES  |     | NULL    |                |
+| name    | human readable name of group                                                              | varchar(255)       | NO   |     |         |                |
+
+Indexes
+------------
+
+| Name    | Fields |
+| ------- | ------ |
+| PRIMARY | id     |
+| uid     | uid    |
+| cid     | cid    |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uid | [user](help/database/db_user) | uid |
+| cid | [contact](help/database/db_contact) | id |
 
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