diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ae875e..248b88a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,7 @@ All notable changes to this project will be documented in this file.
 - Generate PHPDoc for Laravel 8.x factories [\#1074 / ahmed-aliraqi](https://github.com/barryvdh/laravel-ide-helper/pull/1074)
 - Add a comment to a property like table columns [\#1168 / biiiiiigmonster](https://github.com/barryvdh/laravel-ide-helper/pull/1168)
 - Added `post_migrate` hook to run commands after a migration [\#1163 / netpok](https://github.com/barryvdh/laravel-ide-helper/pull/1163)
+- Allow for PhpDoc for macros with union types [\#1148 / riesjart](https://github.com/barryvdh/laravel-ide-helper/pull/1148)
 
 ### Fixed
 - Error when generating helper for invokable classes [\#1124 / standaniels](https://github.com/barryvdh/laravel-ide-helper/pull/1124)
diff --git a/src/Macro.php b/src/Macro.php
index 9de37e1..53421b4 100644
--- a/src/Macro.php
+++ b/src/Macro.php
@@ -42,8 +42,16 @@ class Macro extends Method
         // Add macro parameters if they are missed in original docblock
         if (!$this->phpdoc->hasTag('param')) {
             foreach ($method->getParameters() as $parameter) {
-                $type = $parameter->hasType() ? $parameter->getType()->getName() : 'mixed';
-                $type .= $parameter->hasType() && $parameter->getType()->allowsNull() ? '|null' : '';
+                $reflectionType = $parameter->getType();
+
+                $type = $this->concatReflectionTypes($reflectionType);
+
+                /** @psalm-suppress UndefinedClass */
+                if ($reflectionType && !$reflectionType instanceof \ReflectionUnionType && $reflectionType->allowsNull()) {
+                    $type .= '|null';
+                }
+
+                $type = $type ?: 'mixed';
 
                 $name = $parameter->isVariadic() ? '...' : '';
                 $name .= '$' . $parameter->getName();
@@ -57,14 +65,31 @@ class Macro extends Method
             $builder = EloquentBuilder::class;
             $return = $method->getReturnType();
 
-            $type = $return->getName();
-            $type .= $this->root === "\\{$builder}" && $return->getName() === $builder ? '|static' : '';
-            $type .= $return->allowsNull() ? '|null' : '';
+            $type = $this->concatReflectionTypes($return);
+
+            /** @psalm-suppress UndefinedClass */
+            if (!$return instanceof \ReflectionUnionType) {
+                $type .= $this->root === "\\{$builder}" && $return->getName() === $builder ? '|static' : '';
+                $type .= $return->allowsNull() ? '|null' : '';
+            }
 
             $this->phpdoc->appendTag(Tag::createInstance("@return {$type}"));
         }
     }
 
+    protected function concatReflectionTypes(?\ReflectionType $type): string
+    {
+        /** @psalm-suppress UndefinedClass */
+        $returnTypes = $type instanceof \ReflectionUnionType
+            ? $type->getTypes()
+            : [$type];
+
+        return Collection::make($returnTypes)
+            ->filter()
+            ->map->getName()
+            ->implode('|');
+    }
+
     protected function addLocationToPhpDoc()
     {
         if ($this->method->name === '__invoke') {
diff --git a/tests/MacroTest.php b/tests/MacroTest.php
index 2d18662..a0fa904 100644
--- a/tests/MacroTest.php
+++ b/tests/MacroTest.php
@@ -188,6 +188,29 @@ class MacroTest extends TestCase
         $this->assertEquals('@return \stdClass|null rrrrrrr', $this->tagsToString($phpdoc, 'return'));
     }
 
+    public function testInitPhpDocParamsWithUnionTypes(): void
+    {
+        if (PHP_VERSION_ID < 80000) {
+            $this->markTestSkipped('This test requires PHP 8.0 or higher');
+        }
+
+        $phpdoc = (new MacroMock())->getPhpDoc(eval(<<<'PHP'
+            return new ReflectionFunction(
+                /**
+                 * Test docblock.
+                 */
+                function (\Stringable|string $a = null): \Stringable|string|null {
+                    return $a;
+                }
+            );
+        PHP));
+
+        $this->assertNotNull($phpdoc);
+        $this->assertStringContainsString('Test docblock', $phpdoc->getText());
+        $this->assertEquals('@param \Stringable|string|null $a', $this->tagsToString($phpdoc, 'param'));
+        $this->assertEquals('@return \Stringable|string|null', $this->tagsToString($phpdoc, 'return'));
+    }
+
     protected function tagsToString(DocBlock $docBlock, string $name)
     {
         $tags = $docBlock->getTagsByName($name);