diff --git a/filterpy/changelog.txt b/filterpy/changelog.txt
index ec09b03..24d10e7 100644
--- a/filterpy/changelog.txt
+++ b/filterpy/changelog.txt
@@ -1,3 +1,8 @@
+Version 0.1.5
+=============
+
+* Bug in Q_continuous_white_noise(). The first term in the matrix should be (dt**3)/3, not (dt**4)/3. 
+
 Version 0.1.4
 =============
 
diff --git a/filterpy/kalman/tests/test_ckf.py b/filterpy/kalman/tests/test_ckf.py
index 2e13688..20e7b6c 100644
--- a/filterpy/kalman/tests/test_ckf.py
+++ b/filterpy/kalman/tests/test_ckf.py
@@ -8,6 +8,7 @@
 
 from filterpy.kalman import CubatureKalmanFilter as CKF
 from filterpy.kalman import UnscentedKalmanFilter as UKF
+from filterpy.kalman import MerweScaledSigmaPoints
 import matplotlib.pyplot as plt
 import numpy as np
 from numpy.random import randn
@@ -135,7 +136,5 @@ def hx(x):
         assert abs(ckf.x[1] -kf.x[1]) < 1e-10
 
 
-    plt.show()
-
 if __name__ == "__main__":
     test_1d()
\ No newline at end of file