diff --git a/src/components/app/app.ts b/src/components/app/app.ts
index 1ca2004..71c2ca6 100644
--- a/src/components/app/app.ts
+++ b/src/components/app/app.ts
@@ -33,6 +33,8 @@ export interface Assignment
 
     scoreMax: number
     score: number
+
+    gradingPeriod: number
 }
 
 @Component({