diff --git a/src/Type/Definition/LeafType.php b/src/Type/Definition/LeafType.php
index 51d6af2..e813628 100644
--- a/src/Type/Definition/LeafType.php
+++ b/src/Type/Definition/LeafType.php
@@ -17,7 +17,7 @@ interface LeafType
     public function serialize($value);
 
     /**
-     * Parses an externally provided value to use as an input
+     * Parses an externally provided value (query variable) to use as an input
      *
      * @param mixed $value
      * @return mixed
@@ -25,9 +25,9 @@ interface LeafType
     public function parseValue($value);
 
     /**
-     * Parses an externally provided literal value to use as an input
+     * Parses an externally provided literal value (hardcoded in GraphQL query) to use as an input
      *
-     * @param \GraphQL\Language\AST\Value $valueAST
+     * @param \GraphQL\Language\AST\Node $valueAST
      * @return mixed
      */
     public function parseLiteral($valueAST);
diff --git a/src/Type/Definition/ObjectType.php b/src/Type/Definition/ObjectType.php
index 134a248..f40e0b9 100644
--- a/src/Type/Definition/ObjectType.php
+++ b/src/Type/Definition/ObjectType.php
@@ -99,7 +99,7 @@ class ObjectType extends Type implements OutputType, CompositeType
                 Config::MAYBE_THUNK
             ),
             'isTypeOf' => Config::CALLBACK, // ($value, $context, ResolveInfo $info) => boolean
-            'resolveField' => Config::CALLBACK
+            'resolveField' => Config::CALLBACK // ($value, $args, $context, ResolveInfo $info) => $fieldValue
         ]);
 
         $this->name = $config['name'];