Remove mentions of "plain" integers.
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index a5e858b..af79e53 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -821,9 +821,9 @@
.. index:: single: inversion
-The unary ``~`` (invert) operator yields the bitwise inversion of its plain or
-long integer argument. The bitwise inversion of ``x`` is defined as
-``-(x+1)``. It only applies to integral numbers.
+The unary ``~`` (invert) operator yields the bitwise inversion of its integer
+argument. The bitwise inversion of ``x`` is defined as ``-(x+1)``. It only
+applies to integral numbers.
.. index:: exception: TypeError