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diff --git a/doc/database/db_conversation.md b/doc/database/db_conversation.md
index 32d030cb15..504b0dd4ae 100644
--- a/doc/database/db_conversation.md
+++ b/doc/database/db_conversation.md
@@ -1,14 +1,30 @@
 Table conversation
-==================
-
-| Field             | Description                        | Type                | Null | Key | Default             | Extra          |
-|-------------------| ---------------------------------- |---------------------|------|-----|---------------------|----------------|
-| item-uri          | URI of the item                    | varbinary(255)      | NO   | PRI | NULL                |                |
-| reply-to-uri      | URI to which this item is a reply  | varbinary(255)      | NO   |     |                     |                |
-| conversation-uri  | GNU Social conversation URI        | varbinary(255)      | NO   |     |                     |                |
-| conversation-href | GNU Social conversation link       | varbinary(255)      | NO   |     |                     |                |
-| protocol          | The protocol of the item           | tinyint(1) unsigned | NO   |     | 0                   |                |
-| source            | Original source                    | mediumtext          | NO   |     |                     |                |
-| received          | Receiving date                     | datetime            | NO   |     | 0001-01-01          |                |
+===========
+
+Raw data and structure information for messages
+
+Fields
+------
+
+| Field             | Description                                                          | Type             | Null | Key | Default             | Extra |
+| ----------------- | -------------------------------------------------------------------- | ---------------- | ---- | --- | ------------------- | ----- |
+| item-uri          | Original URI of the item - unrelated to the table with the same name | varbinary(255)   | NO   | PRI | NULL                |       |
+| reply-to-uri      | URI to which this item is a reply                                    | varbinary(255)   | NO   |     |                     |       |
+| conversation-uri  | GNU Social conversation URI                                          | varbinary(255)   | NO   |     |                     |       |
+| conversation-href | GNU Social conversation link                                         | varbinary(255)   | NO   |     |                     |       |
+| protocol          | The protocol of the item                                             | tinyint unsigned | NO   |     | 255                 |       |
+| direction         | How the message arrived here: 1=push, 2=pull                         | tinyint unsigned | NO   |     | 0                   |       |
+| source            | Original source                                                      | mediumtext       | YES  |     | NULL                |       |
+| received          | Receiving date                                                       | datetime         | NO   |     | 0001-01-01 00:00:00 |       |
+
+Indexes
+------------
+
+| Name             | Fields           |
+| ---------------- | ---------------- |
+| PRIMARY          | item-uri         |
+| conversation-uri | conversation-uri |
+| received         | received         |
+
 
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