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diff --git a/doc/database/db_manage.md b/doc/database/db_manage.md
index 4cfc1d0a11..8a2228a5ef 100644
--- a/doc/database/db_manage.md
+++ b/doc/database/db_manage.md
@@ -1,10 +1,32 @@
 Table manage
-============
+===========
 
-| Field | Description   | Type    | Null | Key | Default | Extra           |
-| ----- | ------------- | ------- | ---- | --- | ------- | --------------- |
-| id    | sequential ID | int(11) | NO   | PRI | NULL    | auto_increment  |
-| uid   | user.id       | int(11) | NO   | MUL | 0       |                 |
-| mid   |               | int(11) | NO   |     | 0       |                 |
+table of accounts that can manage each other
+
+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       |                |
+| mid   | User id       | mediumint unsigned | NO   |     | 0       |                |
+
+Indexes
+------------
+
+| Name    | Fields           |
+| ------- | ---------------- |
+| PRIMARY | id               |
+| uid_mid | UNIQUE, uid, mid |
+| mid     | mid              |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uid | [user](help/database/db_user) | uid |
+| mid | [user](help/database/db_user) | uid |
 
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