diff --git a/src/Database/DBStructure.php b/src/Database/DBStructure.php
index 4cf96db26..60859e53c 100644
--- a/src/Database/DBStructure.php
+++ b/src/Database/DBStructure.php
@@ -1549,10 +1549,10 @@ class DBStructure
 				"comment" => "Queue for messages that couldn't be delivered",
 				"fields" => [
 						"id" => ["type" => "int", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => ""],
-						"cid" => ["type" => "int", "not null" => "1", "default" => "0", "relation" => ["contact" => "id"], "comment" => ""],
-						"network" => ["type" => "varchar(32)", "not null" => "1", "default" => "", "comment" => ""],
-						"guid" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => ""],
-						"created" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => ""],
+						"cid" => ["type" => "int", "not null" => "1", "default" => "0", "relation" => ["contact" => "id"], "comment" => "Message receiver"],
+						"network" => ["type" => "varchar(32)", "not null" => "1", "default" => "", "comment" => "Receiver's network"],
+						"guid" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "Unique GUID of the message"],
+						"created" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => "Date, when the message was created"],
 						"last" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => ""],
 						"content" => ["type" => "mediumtext", "comment" => ""],
 						"batch" => ["type" => "boolean", "not null" => "1", "default" => "0", "comment" => ""],