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diff --git a/doc/database/db_post-category.md b/doc/database/db_post-category.md
index 3765072d0e..f28e306f17 100644
--- a/doc/database/db_post-category.md
+++ b/doc/database/db_post-category.md
@@ -1,12 +1,34 @@
 Table post-category
 ===========
+
 post relation to categories
 
-| Field | Description | Type | Null | Key | Default | Extra |
-| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned | YES | PRI |  |  |    
-| uid | User id | mediumint unsigned | YES | PRI | 0 |  |    
-| type |  | tinyint unsigned | YES | PRI | 0 |  |    
-| tid |  | int unsigned | YES | 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    |       |
+| uid    | User id                                                   | mediumint unsigned | NO   | PRI | 0       |       |
+| type   |                                                           | tinyint unsigned   | NO   | PRI | 0       |       |
+| tid    |                                                           | int unsigned       | NO   | PRI | 0       |       |
+
+Indexes
+------------
+
+| Name       | Fields                 |
+| ---------- | ---------------------- |
+| PRIMARY    | uri-id, uid, type, tid |
+| tid        | tid                    |
+| uid_uri-id | uid, uri-id            |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uri-id | [item-uri](help/database/db_item-uri) | id |
+| uid | [user](help/database/db_user) | uid |
+| tid | [tag](help/database/db_tag) | id |
 
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