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diff --git a/doc/database/db_locks.md b/doc/database/db_locks.md
index 4de6fbf961..dc5371184d 100644
--- a/doc/database/db_locks.md
+++ b/doc/database/db_locks.md
@@ -1,11 +1,26 @@
 Table locks
 ===========
 
-| Field   | Description      | Type             | Null | Key | Default             | Extra          |
-|---------|------------------|------------------|------|-----|---------------------|----------------|
-| id      | sequential ID    | int(11)          | NO   | PRI | NULL                | auto_increment |
-| name    |                  | varchar(128)     | NO   |     |                     |                |
-| locked  |                  | tinyint(1)       | NO   |     | 0                   |                |
-| pid     | Process ID       | int(10) unsigned | NO   |     | 0                   |                |
+
+
+Fields
+------
+
+| Field   | Description                  | Type         | Null | Key | Default             | Extra          |
+| ------- | ---------------------------- | ------------ | ---- | --- | ------------------- | -------------- |
+| id      | sequential ID                | int unsigned | NO   | PRI | NULL                | auto_increment |
+| name    |                              | varchar(128) | NO   |     |                     |                |
+| locked  |                              | boolean      | NO   |     | 0                   |                |
+| pid     | Process ID                   | int unsigned | NO   |     | 0                   |                |
+| expires | datetime of cache expiration | datetime     | NO   |     | 0001-01-01 00:00:00 |                |
+
+Indexes
+------------
+
+| Name         | Fields        |
+| ------------ | ------------- |
+| PRIMARY      | id            |
+| name_expires | name, expires |
+
 
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