docs: changelog for https://github.com/wez/wezterm/pull/3344

docs/changelog.md

@@ -28,6 +28,9 @@ As features stabilize some brief notes about them will accumulate here.
 * [wezterm cli kill-pane](cli/cli/kill-pane.md),
   [wezterm cli activate-pane](cli/cli/activate-pane.md) and
   [wezterm cli activate-tab](cli/cli/activate-tab.md) #3352 #886
+* macOS:
+  [macos_window_background_blur](config/lua/config/macos_window_background_blur.md)
+  enables a nice translucent window effect. Thanks to @Gkirito! #3344
 
 #### Fixed
 * ssh ProxyCommand didn't parse command lines containing `=` correctly. #3307

docs/config/lua/config/macos_window_background_blur.md

@@ -0,0 +1,20 @@
+# `macos_window_background_blur = 0`
+
+{{since('nightly')}}
+
+When combined with `window_background_opacity`, configures the blur radius
+amount used by macOS when compositing the window on the screen.
+
+This can be used to produce a translucent window effect rather than
+a crystal clear transparent window effect.
+
+The screenshot below was achieved using this configuration:
+
+```lua
+config.window_background_opacity = 0.3
+config.macos_window_background_blur = 20
+```
+
+![Screenshot](../../../screenshots/wezterm-macos-background-blur.png)
+
+The default value for `macos_window_background_blur` is `0`.