diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Position.java b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
index 89b9b71..3097f20 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Position.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
@@ -6,7 +6,7 @@
 import java.util.HashMap;
 import java.util.UUID;
 
-public class Position {
+public class Position implements Comparable {
     private int i;
     private float x;
     private float y;
@@ -27,4 +27,15 @@
         this.y = y;
     }
 
+    @Override
+    public int compareTo(Object o) {
+        if (o instanceof Position) {
+            if (i < ((Position) o).i) {
+                return -1;
+            } else if (i > ((Position) o).i) {
+                return 1;
+            }
+        }
+        return 0;
+    }
 }