diff --git a/core/Messenger.c b/core/Messenger.c
index 272c5fa7..641dbf8e 100644
--- a/core/Messenger.c
+++ b/core/Messenger.c
@@ -99,16 +99,19 @@ int getclient_id(int friend_id, uint8_t *client_id)
    client_id is the client id of the friend
    data is the data and length is the length
    returns the friend number if success
-   return -1 if failure. */
+   return -1 if key length is wrong.
+   return -2 if user's own key
+   return -3 if already a friend
+   return -4 for other*/
 int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
 {
     if (length == 0 || length >=
         (MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES - crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES + crypto_box_ZEROBYTES))
         return -1;
     if (memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
-        return -1;
+        return -2;
     if (getfriend_id(client_id) != -1)
-        return -1;
+        return -3;
     uint32_t i;
     for (i = 0; i <= numfriends; ++i) {
         if(friendlist[i].status == 0) {
@@ -126,7 +129,7 @@ int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
             return i;
         }
     }
-    return -1;
+    return -4;
 }
 
 int m_addfriend_norequest(uint8_t * client_id)