diff --git a/src/Nether/Database/Prototype.php b/src/Nether/Database/Prototype.php
index 7a73acd..47dab1f 100755
--- a/src/Nether/Database/Prototype.php
+++ b/src/Nether/Database/Prototype.php
@@ -523,7 +523,8 @@ static public function
 			'Debug'     => FALSE,
 			'Filters'   => NULL,
 			'Resolvers' => NULL,
-			'Remappers' => NULL
+			'Remappers' => NULL,
+			'CustomFilterFunc' => NULL
 		]);
 
 		$Opt->MergeRight($Input);
@@ -551,6 +552,9 @@ static public function
 		static::FindExtendTables($SQL, $Opt);
 		static::FindExtendFilters($SQL, $Opt);
 
+		if(is_callable($Opt['CustomFilterFunc']))
+		($Opt['CustomFilterFunc'])($SQL, $Opt);
+
 		// before checking if an extension class wants to add sorting
 		// we will supply the default implementations for sorting by this
 		// table primary key. it is optimal here as we have already asked