diff --git a/src/logic/course.ts b/src/logic/course.ts
index 6f02ec0..2e99ec6 100644
--- a/src/logic/course.ts
+++ b/src/logic/course.ts
@@ -32,6 +32,9 @@ export default class Course
         allYearGrade: number
     };
 
+    // Useless string, used to update
+    temp: string;
+
     /**
      * Construct a course with a course json object
      *