diff --git a/docs/docs/SETTINGS.md b/docs/docs/SETTINGS.md
index d8a9791d..269d9676 100644
--- a/docs/docs/SETTINGS.md
+++ b/docs/docs/SETTINGS.md
@@ -411,6 +411,10 @@ Serialization settings
 Default: 30  
 Description: Serialization will be made automatically every N seconds
 
+### `$settings['serialization']['cleanup_before_serialization']`
+Default: false  
+Description: Remove data from internal database to cleanup memory and reduce `*.madeline` file size (may cause MadelineProto errors).
+
 
 <hr>
 
@@ -431,4 +435,4 @@ The settings array can be accessed and modified in the instantiated class by acc
 $MadelineProto->settings['updates']['handle_updates'] = true; // reenable update fetching
 ```
 
-<a href="https://docs.madelineproto.xyz/docs/SELF.html">Next section</a>
\ No newline at end of file
+<a href="https://docs.madelineproto.xyz/docs/SELF.html">Next section</a>