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diff --git a/doc/database/db_contact-relation.md b/doc/database/db_contact-relation.md
index 82b90f79e2..8628b1ef66 100644
--- a/doc/database/db_contact-relation.md
+++ b/doc/database/db_contact-relation.md
@@ -1,13 +1,33 @@
 Table contact-relation
 ===========
+
 Contact relations
 
-| Field            | Description                                         | Type         | Null | Key | Default             | Extra |    
-| ---------------- | --------------------------------------------------- | ------------ | ---- | --- | ------------------- | ----- |    
-| cid              | contact the related contact had interacted with     | int unsigned | NO   | PRI | 0                   |       |    
-| relation-cid     | related contact who had interacted with the contact | int unsigned | NO   | PRI | 0                   |       |    
-| last-interaction | Date of the last interaction                        | datetime     | NO   |     | 0001-01-01 00:00:00 |       |    
-| follow-updated   | Date of the last update of the contact relationship | datetime     | NO   |     | 0001-01-01 00:00:00 |       |    
-| follows          |                                                     | boolean      | NO   |     | 0                   |       |    
+Fields
+------
+
+| Field            | Description                                         | Type         | Null | Key | Default             | Extra |
+| ---------------- | --------------------------------------------------- | ------------ | ---- | --- | ------------------- | ----- |
+| cid              | contact the related contact had interacted with     | int unsigned | NO   | PRI | 0                   |       |
+| relation-cid     | related contact who had interacted with the contact | int unsigned | NO   | PRI | 0                   |       |
+| last-interaction | Date of the last interaction                        | datetime     | NO   |     | 0001-01-01 00:00:00 |       |
+| follow-updated   | Date of the last update of the contact relationship | datetime     | NO   |     | 0001-01-01 00:00:00 |       |
+| follows          |                                                     | boolean      | NO   |     | 0                   |       |
+
+Indexes
+------------
+
+| Name         | Fields            |
+| ------------ | ----------------- |
+| PRIMARY      | cid, relation-cid |
+| relation-cid | relation-cid      |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| cid | [contact](help/database/db_contact) | id |
+| relation-cid | [contact](help/database/db_contact) | id |
 
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