diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index d019bf4..384d2bf 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -20,7 +20,7 @@
 
 * coded in 100% pure Python, using the :mod:`tkinter` GUI toolkit
 
-* cross-platform: works mostly the same on Windows, Unix, and Mac OS X
+* cross-platform: works mostly the same on Windows, Unix, and macOS
 
 * Python shell window (interactive interpreter) with colorizing
   of code input, output, and error messages
@@ -48,7 +48,7 @@
 window.  They currently have the same top menu but a different
 default title and context menu.
 
-On MacOS, there is one application menu.  It dynamically changes according
+On macOS, there is one application menu.  It dynamically changes according
 to the window currently selected.  It has an IDLE menu, and some entries
 described below are moved around to conform to Apple guidlines.
 
@@ -267,7 +267,7 @@
 Configure IDLE
    Open a configuration dialog and change preferences for the following:
    fonts, indentation, keybindings, text color themes, startup windows and
-   size, additional help sources, and extensions (see below).  On OS X,
+   size, additional help sources, and extensions (see below).  On macOS,
    open the configuration dialog by selecting Preferences in the application
    menu.  To use a new built-in color theme (IDLE Dark) with older IDLEs,
    save it as a new custom theme.
@@ -324,7 +324,7 @@
 Context Menus
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Open a context menu by right-clicking in a window (Control-click on OS X).
+Open a context menu by right-clicking in a window (Control-click on macOS).
 Context menus have the standard clipboard functions also on the Edit menu.
 
 Cut
@@ -381,7 +381,7 @@
 ^^^^^^^^^^^^
 
 In this section, 'C' refers to the :kbd:`Control` key on Windows and Unix and
-the :kbd:`Command` key on Mac OSX.
+the :kbd:`Command` key on macOS.
 
 * :kbd:`Backspace` deletes to the left; :kbd:`Del` deletes to the right
 
@@ -526,9 +526,9 @@
   Command history
 
   * :kbd:`Alt-p` retrieves previous command matching what you have typed. On
-    OS X use :kbd:`C-p`.
+    macOS use :kbd:`C-p`.
 
-  * :kbd:`Alt-n` retrieves next. On OS X use :kbd:`C-n`.
+  * :kbd:`Alt-n` retrieves next. On macOS use :kbd:`C-n`.
 
   * :kbd:`Return` while on any previous command retrieves that command
 
@@ -796,7 +796,7 @@
 IDLE ships with four built-in key sets. In addition, a user can create a
 custom key set in the Configure IDLE dialog under the keys tab.
 
-IDLE on MacOS
+IDLE on macOS
 ^^^^^^^^^^^^^
 
 Under System Preferences: Dock, one can set "Prefer tabs when opening