diff --git a/android/src/main/res/navigation/nav_graph.xml b/android/src/main/res/navigation/nav_graph.xml
index 54d8590..a21e1c7 100644
--- a/android/src/main/res/navigation/nav_graph.xml
+++ b/android/src/main/res/navigation/nav_graph.xml
@@ -57,5 +57,10 @@
     <activity
         android:id="@+id/addEditCategoryActivity"
         android:name="com.wbrawner.budget.ui.categories.CategoryFormActivity"
-        android:label="@string/title_add_category" />
+        android:label="@string/title_add_category" >
+        <argument
+            android:name="categoryId"
+            app:argType="string"
+            app:nullable="true" />
+    </activity>
 </navigation>
\ No newline at end of file