diff --git a/lib/Misc/QueryFilter.php b/lib/Misc/QueryFilter.php
index 12c3bd3..f4a663d 100644
--- a/lib/Misc/QueryFilter.php
+++ b/lib/Misc/QueryFilter.php
@@ -16,7 +16,7 @@ class QueryFilter {
 
     public $filterRestrictive = true;
 
-    public function setWhere(string $where, $types = null, $values = null): self {
+    public function setWhere(string $where, $types = null, $values = null): static {
         $this->qWhere[] = $where;
         if (!is_null($types)) {
             $this->tWhere[] = $types ?? [];
@@ -25,7 +25,7 @@ class QueryFilter {
         return $this;
     }
 
-    public function setWhereNot(string $where, $types = null, $values = null): self {
+    public function setWhereNot(string $where, $types = null, $values = null): static {
         $this->qWhereNot[] = $where;
         if (!is_null($types)) {
             $this->tWhereNot[] = $types;
@@ -34,7 +34,7 @@ class QueryFilter {
         return $this;
     }
 
-    public function setFilter(self $filter): self {
+    public function setFilter(self $filter): static {
         $this->qWhere[] = "(".$filter->buildWhereBody().")";
         $this->tWhere[] = $filter->getWhereTypes();
         $this->vWhere[] = $filter->getWhereValues();
diff --git a/tests/cases/Misc/TestQuery.php b/tests/cases/Misc/TestQuery.php
index 053d109..f78ac2d 100644
--- a/tests/cases/Misc/TestQuery.php
+++ b/tests/cases/Misc/TestQuery.php
@@ -8,7 +8,10 @@ namespace JKingWeb\Arsse\TestCase\Misc;
 
 use JKingWeb\Arsse\Misc\Query;
 
-/** @covers \JKingWeb\Arsse\Misc\Query */
+/** 
+ * @covers \JKingWeb\Arsse\Misc\Query
+ * @covers \JKingWeb\Arsse\Misc\QueryFilter 
+ */
 class TestQuery extends \JKingWeb\Arsse\Test\AbstractTest {
     public function testBasicQuery(): void {
         $q = new Query("select * from table where a = ?", "int", 3);