diff --git a/src/Psalm/Internal/Provider/MethodReturnTypeProvider.php b/src/Psalm/Internal/Provider/MethodReturnTypeProvider.php
index 30985199e9d..cd06f4a8a86 100644
--- a/src/Psalm/Internal/Provider/MethodReturnTypeProvider.php
+++ b/src/Psalm/Internal/Provider/MethodReturnTypeProvider.php
@@ -74,7 +74,7 @@ public function has(string $fq_classlike_name): bool
 
     /**
      * @param PhpParser\Node\Expr\MethodCall|PhpParser\Node\Expr\StaticCall $stmt
-     * @param  ?array<Union> $template_type_parameters
+     * @param non-empty-list<Union>|null $template_type_parameters
      */
     public function getReturnType(
         StatementsSource $statements_source,
diff --git a/src/Psalm/Plugin/EventHandler/Event/MethodReturnTypeProviderEvent.php b/src/Psalm/Plugin/EventHandler/Event/MethodReturnTypeProviderEvent.php
index 97a76196f35..8e4e58bced2 100644
--- a/src/Psalm/Plugin/EventHandler/Event/MethodReturnTypeProviderEvent.php
+++ b/src/Psalm/Plugin/EventHandler/Event/MethodReturnTypeProviderEvent.php
@@ -22,9 +22,7 @@ final class MethodReturnTypeProviderEvent
      * @var PhpParser\Node\Expr\MethodCall|PhpParser\Node\Expr\StaticCall
      */
     private $stmt;
-    /**
-     * @var Union[]|null
-     */
+    /** @var non-empty-list<Union>|null */
     private ?array $template_type_parameters;
     private ?string $called_fq_classlike_name;
     /**
@@ -38,7 +36,7 @@ final class MethodReturnTypeProviderEvent
      * something should be returned, but can't be more specific.
      *
      * @param PhpParser\Node\Expr\MethodCall|PhpParser\Node\Expr\StaticCall $stmt
-     * @param  ?array<Union> $template_type_parameters
+     * @param non-empty-list<Union>|null $template_type_parameters
      * @param lowercase-string $method_name_lowercase
      * @param lowercase-string $called_method_name_lowercase
      * @internal
@@ -102,7 +100,7 @@ public function getCodeLocation(): CodeLocation
     }
 
     /**
-     * @return Union[]|null
+     * @return non-empty-list<Union>|null
      */
     public function getTemplateTypeParameters(): ?array
     {