diff --git a/GPy/core/gp.py b/GPy/core/gp.py
index 5546eac6..7bad7648 100644
--- a/GPy/core/gp.py
+++ b/GPy/core/gp.py
@@ -28,7 +28,7 @@ class GP(Model):
     :param Norm normalizer:
         normalize the outputs Y.
         Prediction will be un-normalized using this normalizer.
-        If normalizer is None, we will normalize using Standardize.
+        If normalizer is True, we will normalize using Standardize.
         If normalizer is False, no normalization will be done.
 
     .. Note:: Multiple independent outputs are allowed using columns of Y