diff --git a/lib/Doctrine/DBAL/Query/QueryBuilder.php b/lib/Doctrine/DBAL/Query/QueryBuilder.php
index bc493fcac00..660ddd05be7 100644
--- a/lib/Doctrine/DBAL/Query/QueryBuilder.php
+++ b/lib/Doctrine/DBAL/Query/QueryBuilder.php
@@ -122,7 +122,7 @@ class QueryBuilder
     private $firstResult = 0;
 
     /**
-     * The maximum number of results to retrieve.
+     * The maximum number of results to retrieve or NULL to retrieve all results.
      *
      * @var int|null
      */
@@ -365,7 +365,6 @@ public function setFirstResult(int $firstResult) : self
 
     /**
      * Gets the position of the first result the query object was set to retrieve (the "offset").
-     * Returns NULL if {@link setFirstResult} was not applied to this QueryBuilder.
      *
      * @return int The position of the first result.
      */
@@ -377,11 +376,11 @@ public function getFirstResult() : int
     /**
      * Sets the maximum number of results to retrieve (the "limit").
      *
-     * @param int $maxResults The maximum number of results to retrieve.
+     * @param int|null $maxResults The maximum number of results to retrieve or NULL to retrieve all results.
      *
      * @return $this This QueryBuilder instance.
      */
-    public function setMaxResults(int $maxResults) : self
+    public function setMaxResults(?int $maxResults) : self
     {
         $this->state      = self::STATE_DIRTY;
         $this->maxResults = $maxResults;
@@ -391,7 +390,7 @@ public function setMaxResults(int $maxResults) : self
 
     /**
      * Gets the maximum number of results the query object was set to retrieve (the "limit").
-     * Returns NULL if {@link setMaxResults} was not applied to this query builder.
+     * Returns NULL if all results will be returned.
      *
      * @return int|null The maximum number of results.
      */
diff --git a/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php b/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
index d8c850f52a9..8c5c743e351 100644
--- a/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
+++ b/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
@@ -474,13 +474,27 @@ public function testGetState() : void
         self::assertEquals($sql1, $qb->getSQL());
     }
 
-    public function testSetMaxResults() : void
+    /**
+     * @dataProvider maxResultsProvider
+     */
+    public function testSetMaxResults(?int $maxResults) : void
     {
         $qb = new QueryBuilder($this->conn);
-        $qb->setMaxResults(10);
+        $qb->setMaxResults($maxResults);
 
         self::assertEquals(QueryBuilder::STATE_DIRTY, $qb->getState());
-        self::assertEquals(10, $qb->getMaxResults());
+        self::assertEquals($maxResults, $qb->getMaxResults());
+    }
+
+    /**
+     * @return mixed[][]
+     */
+    public static function maxResultsProvider() : iterable
+    {
+        return [
+            'non-null' => [10],
+            'null' => [null],
+        ];
     }
 
     public function testSetFirstResult() : void