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diff --git a/doc/database/db_post-tag.md b/doc/database/db_post-tag.md
index 53df02cbe0..7811f32e07 100644
--- a/doc/database/db_post-tag.md
+++ b/doc/database/db_post-tag.md
@@ -1,12 +1,34 @@
 Table post-tag
 ===========
+
 post relation to tags
 
-| Field  | Description                                               | Type             | Null | Key | Default | Extra |    
-| ------ | --------------------------------------------------------- | ---------------- | ---- | --- | ------- | ----- |    
-| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned     | NO   | PRI | NULL    |       |    
-| type   |                                                           | tinyint unsigned | NO   | PRI | 0       |       |    
-| tid    |                                                           | int unsigned     | NO   | PRI | 0       |       |    
-| cid    | Contact id of the mentioned public contact                | int unsigned     | NO   | PRI | 0       |       |    
+Fields
+------
+
+| Field  | Description                                               | Type             | Null | Key | Default | Extra |
+| ------ | --------------------------------------------------------- | ---------------- | ---- | --- | ------- | ----- |
+| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned     | NO   | PRI | NULL    |       |
+| type   |                                                           | tinyint unsigned | NO   | PRI | 0       |       |
+| tid    |                                                           | int unsigned     | NO   | PRI | 0       |       |
+| cid    | Contact id of the mentioned public contact                | int unsigned     | NO   | PRI | 0       |       |
+
+Indexes
+------------
+
+| Name    | Fields                 |
+| ------- | ---------------------- |
+| PRIMARY | uri-id, type, tid, cid |
+| tid     | tid                    |
+| cid     | cid                    |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uri-id | [item-uri](help/database/db_item-uri) | id |
+| tid | [tag](help/database/db_tag) | id |
+| cid | [contact](help/database/db_contact) | id |
 
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