diff --git a/src/Utils/FindBreakingChanges.php b/src/Utils/FindBreakingChanges.php
index 8f5a906..c44d78d 100644
--- a/src/Utils/FindBreakingChanges.php
+++ b/src/Utils/FindBreakingChanges.php
@@ -324,7 +324,7 @@ class FindBreakingChanges
             foreach ($newTypeFieldsDef as $fieldName => $fieldDef) {
                 if (!isset($oldTypeFieldsDef[$fieldName]) && $fieldDef->getType() instanceof NonNull) {
                     $newTypeName = $newType->name;
-                    $breakingFieldChanges[] = ['type' => self::BREAKING_CHANGE_NON_NULL_INPUT_FIELD_ADDED, 'description' => "A non-null field ${fieldName} on input type ${$newTypeName} was added"];
+                    $breakingFieldChanges[] = ['type' => self::BREAKING_CHANGE_NON_NULL_INPUT_FIELD_ADDED, 'description' => "A non-null field ${fieldName} on input type ${newTypeName} was added."];
                 }
             }
         }
diff --git a/tests/Utils/FindBreakingChangesTest.php b/tests/Utils/FindBreakingChangesTest.php
index ac792f4..ed87628 100644
--- a/tests/Utils/FindBreakingChangesTest.php
+++ b/tests/Utils/FindBreakingChangesTest.php
@@ -428,4 +428,49 @@ class FindBreakingChangesTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals($expectedFieldChanges, FindBreakingChanges::findFieldsThatChangedType($oldSchema, $newSchema));
     }
+
+    public function testDetectsNonNullFieldAddedToInputType()
+    {
+        $oldInputType = new InputObjectType([
+            'name' => 'InputType1',
+            'fields' => [
+                'field1' => Type::string()
+            ]
+        ]);
+
+        $newInputType = new InputObjectType([
+            'name' => 'InputType1',
+            'fields' => [
+                'field1' => Type::string(),
+                'requiredField' => Type::nonNull(Type::int()),
+                'optionalField' => Type::boolean()
+            ]
+        ]);
+
+        $oldSchema = new Schema([
+            'query' => new ObjectType([
+                'name' => 'root',
+                'fields' => [
+                    'type1' => $oldInputType
+                ]
+            ])
+        ]);
+
+        $newSchema = new Schema([
+            'query' => new ObjectType([
+                'name' => 'root',
+                'fields' => [
+                    'type1' => $newInputType
+                ]
+            ])
+        ]);
+
+        $this->assertEquals(
+            [
+                'type' => FindBreakingChanges::BREAKING_CHANGE_NON_NULL_INPUT_FIELD_ADDED,
+                'description' => 'A non-null field requiredField on input type InputType1 was added.'
+            ],
+            FindBreakingChanges::findFieldsThatChangedType($oldSchema, $newSchema)[0]
+        );
+    }
 }
\ No newline at end of file