diff --git a/src/Utils/FindBreakingChanges.php b/src/Utils/FindBreakingChanges.php
index a2cab12..11988fe 100644
--- a/src/Utils/FindBreakingChanges.php
+++ b/src/Utils/FindBreakingChanges.php
@@ -195,7 +195,7 @@ class FindBreakingChanges
                             $newTypeName = $newTypeDefinition->name;
                             $breakingChanges[] = [
                                 'type' => self::BREAKING_CHANGE_NON_NULL_ARG_ADDED,
-                                'description' => "A non-null arg ${$newArgName} on ${newTypeName}->${fieldName} was added."
+                                'description' => "A non-null arg ${newArgName} on ${newTypeName}->${fieldName} was added."
                             ];
                         }
                     }
diff --git a/tests/Utils/FindBreakingChangesTest.php b/tests/Utils/FindBreakingChangesTest.php
index 3af4c83..3ba80bb 100644
--- a/tests/Utils/FindBreakingChangesTest.php
+++ b/tests/Utils/FindBreakingChangesTest.php
@@ -685,4 +685,8 @@ class FindBreakingChangesTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($expectedChanges, FindBreakingChanges::findArgChanges($oldSchema, $newSchema)['breakingChanges']);
     }
+
+    public function testDetectsFieldArgumentTypeChange() {
+
+    }
 }
\ No newline at end of file