diff --git a/data/web/core.telegram.org/gateway/api.html b/data/web/core.telegram.org/gateway/api.html
index e36b7be258..111e694930 100644
--- a/data/web/core.telegram.org/gateway/api.html
+++ b/data/web/core.telegram.org/gateway/api.html
@@ -119,19 +119,19 @@
 <td>callback_url</td>
 <td>String</td>
 <td>Optional</td>
-<td>A URL where you want to receive <a href="#delivery-reports">delivery reports</a> related to the sent message.</td>
+<td>A URL where you want to receive <a href="#report-delivery">delivery reports</a> related to the sent message, 0-256 bytes.</td>
 </tr>
 <tr>
 <td>payload</td>
 <td>String</td>
 <td>Optional</td>
-<td>Custom payload, 0-256 bytes. This will not be displayed to the user, use it for your internal processes.</td>
+<td>Custom payload, 0-128 bytes. This will not be displayed to the user, use it for your internal processes.</td>
 </tr>
 <tr>
 <td>ttl</td>
 <td>Integer</td>
 <td>Optional</td>
-<td>Time-to-live (in seconds) before the message expires and is deleted. The message will not be deleted if it has already been read. If not specified, the message will not be deleted.</td>
+<td>Time-to-live (in seconds) before the message expires and is deleted. The message will not be deleted if it has already been read. If not specified, the message will not be deleted. Supported values are from 60 to 86400.</td>
 </tr>
 </tbody>
 </table>