diff --git a/src/java/com/threerings/util/DirectionCodes.java b/src/java/com/threerings/util/DirectionCodes.java
index 65df9b44..a2122990 100644
--- a/src/java/com/threerings/util/DirectionCodes.java
+++ b/src/java/com/threerings/util/DirectionCodes.java
@@ -35,6 +35,12 @@ public interface DirectionCodes
 
     /** A direction code indicating moving right. */
     public static final int RIGHT = 1;
+    
+    /** A direction code indicating moving up. */
+    public static final int UP = 2;
+
+    /** A direction code indicating moving down. */
+    public static final int DOWN = 3;
 
     /** A direction code indicating a counter-clockwise rotation. */
     public static final int CCW = 0;