diff --git a/spec/API_specification/constants.rst b/spec/API_specification/constants.rst
index aa278a360..4d71ed380 100644
--- a/spec/API_specification/constants.rst
+++ b/spec/API_specification/constants.rst
@@ -22,4 +22,5 @@ Objects in API
    e
    inf
    nan
+   newaxis
    pi
diff --git a/spec/API_specification/signatures/constants.py b/spec/API_specification/signatures/constants.py
index 813b6d079..18c8ac761 100644
--- a/spec/API_specification/signatures/constants.py
+++ b/spec/API_specification/signatures/constants.py
@@ -15,6 +15,11 @@
 IEEE 754 floating-point representation of Not a Number (``NaN``).
 """
 
+newaxis = None
+"""
+An alias for ``None`` which is useful for indexing arrays.
+"""
+
 pi = 3.141592653589793
 """
 IEEE 754 floating-point representation of the mathematical constant ``π``.
@@ -22,4 +27,4 @@
 ``pi = 3.1415926535897932384626433...``
 """
 
-__all__ = ['e', 'inf', 'nan', 'pi']
+__all__ = ['e', 'inf', 'nan', 'newaxis', 'pi']