diff --git a/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java b/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
index 84c46a3..edaa808 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
@@ -25,6 +25,9 @@
     private Integer favos;
     private ArrayList<String> categories;
     private HashMap<String, Comment> commentMap = new HashMap<>();
+
+    public Voicememo() {}
+
     public Voicememo(String vid, String uid, Integer time, String url, double latitude, double longitude, String title, String summary) {
         Calendar upload = Calendar.getInstance();
         setVid(vid);
@@ -127,6 +130,11 @@
     private void setFavos(){
         favos = favolist.size();
     }
+
+    public void setCategory(ArrayList<String> categories) {
+        this.categories = categories;
+    }
+
     public ArrayList<String> getCategory(){ return categories; }
     public void addCategory(String categoryId){
         for (String a : categories) {