diff --git a/doc/database.md b/doc/database.md
index 00a40fb24..e778a0a72 100644
--- a/doc/database.md
+++ b/doc/database.md
@@ -35,6 +35,7 @@ Database Tables
 | [notify-threads](help/database/db_notify-threads)    |                                                  |
 | [oembed](help/database/db_oembed)                    | cache for OEmbed queries                         |
 | [parsed_url](help/database/db_parsed_url)            | cache for "parse_url" queries                    |
+| [participation](help/database/db_participation)      | Storage for participation messages from Diaspora |
 | [pconfig](help/database/db_pconfig)                  | personal (per user) configuration storage        |
 | [photo](help/database/db_photo)                      | photo storage                                    |
 | [poll](help/database/db_poll)                        | data for polls                                   |
diff --git a/doc/database/db_particiation.md b/doc/database/db_particiation.md
new file mode 100644
index 000000000..27f063241
--- /dev/null
+++ b/doc/database/db_particiation.md
@@ -0,0 +1,10 @@
+Table participation
+===================
+
+| Field       | Description      | Type             | Null | Key | Default             | Extra |
+|-------------|------------------|------------------|------|-----|---------------------|-------|
+| iid         | item id          | int(10) unsigned | NO   | PRI |                     |       |
+| server      | Name of server   | varchar(60)      | NO   | PRI |                     |       |
+| cid         | contact id       | int(10) unsigned | NO   |     |                     |       |
+
+Return to [database documentation](help/database)