diff --git a/doc/release/1.11.0-notes.rst b/doc/release/1.11.0-notes.rst
index 580c0c952b74..e60062c81824 100644
--- a/doc/release/1.11.0-notes.rst
+++ b/doc/release/1.11.0-notes.rst
@@ -36,7 +36,7 @@ DeprecationWarning to error
 * Non-integers used as index values raise TypeError,
   e.g., in reshape, take, and specifying reduce axis.
 
-FutureWarning to changed behavior 
+FutureWarning to changed behavior
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 * In ``np.lib.split`` an empty array in the result always had dimension
@@ -89,6 +89,13 @@ The function now internally calls the generic ``npy_amergesort``
 when the type does not implement a merge-sort kind of ``argsort``
 method.
 
+Memory and speed improvements for masked arrays
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Creating a masked array with ``mask=True`` (resp. ``mask=False``) now uses
+``np.ones`` (resp. ``np.zeros``) to create the mask, which is faster and avoid
+a big memory peak. Another optimization was done to avoid a memory peak and
+useless computations when printing a masked array.
+
 Changes
 =======