diff --git a/filterpy/kalman/UKF.py b/filterpy/kalman/UKF.py
index 89e0d89..b96ee4f 100644
--- a/filterpy/kalman/UKF.py
+++ b/filterpy/kalman/UKF.py
@@ -56,12 +56,11 @@ class UnscentedKalmanFilter(object):
     Readable Attributes
     -------------------
 
-    xp : numpy.array(dim_x)
-        predicted state (result of predict())
-
-    Pp : numpy.array(dim_x, dim_x)
-        predicted covariance matrix (result of predict())
+    K : numpy.array
+        Kalman gain
 
+    y : numpy.array
+        innovation residual
 
     References
     ----------