diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 05308a0b114af1df8d738c7cc9ae414114d1c3d2..ffb090aa45a465f759b2206d0a69ed1acc70e4ed 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,8 @@ What's New in IDLE 3.11.0
 Released on 2022-10-03
 =========================
 
+gh-89610: Add .pyi as a recognized extension for IDLE on macOS.  This allows
+opening stub files by double clicking on them in the Finder.
 
 bpo-28950: Apply IDLE syntax highlighting to `.pyi` files.  Add util.py
 for common components.  Patch by Alex Waygood and Terry Jan Reedy.
diff --git a/Mac/IDLE/IDLE.app/Contents/Info.plist b/Mac/IDLE/IDLE.app/Contents/Info.plist
index d197c77ed4b1a3e6b1cac1fb1c7ffe4f25cd7442..799a164cbdf2ed72ffed9897c765f49162402ccd 100644
--- a/Mac/IDLE/IDLE.app/Contents/Info.plist
+++ b/Mac/IDLE/IDLE.app/Contents/Info.plist
@@ -10,6 +10,7 @@
 			<key>CFBundleTypeExtensions</key>
 			<array>
 				<string>py</string>
+				<string>pyi</string>
 				<string>pyw</string>
 			</array>
 			<key>CFBundleTypeIconFile</key>
diff --git a/Misc/NEWS.d/next/IDLE/2022-07-28-18-56-57.gh-issue-89610.hcosiM.rst b/Misc/NEWS.d/next/IDLE/2022-07-28-18-56-57.gh-issue-89610.hcosiM.rst
new file mode 100644
index 0000000000000000000000000000000000000000..0d283711e3e86701b0931ab1e2bf286d1a49c422
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2022-07-28-18-56-57.gh-issue-89610.hcosiM.rst
@@ -0,0 +1,2 @@
+Add .pyi as a recognized extension for IDLE on macOS.    This allows opening
+stub files by double clicking on them in the Finder.