diff --git a/docs/en/UI/AspNetCore/JavaScript-API/Block-Busy.md b/docs/en/UI/AspNetCore/JavaScript-API/Block-Busy.md
new file mode 100644
index 0000000000..943a651432
--- /dev/null
+++ b/docs/en/UI/AspNetCore/JavaScript-API/Block-Busy.md
@@ -0,0 +1,56 @@
+# ASP.NET Core MVC / Razor Pages UI: JavaScript UI Block/Busy API
+
+UI Block API disables (blocks) the page or a part of the page.
+
+## Basic Usage
+
+**Example: Block (disable) the complete page**
+
+````js
+abp.ui.block();
+````
+
+**Example: Block (disable) an HTML element**
+
+````js
+abp.ui.block('#MyContainer');
+````
+
+**Example: Enables the previously blocked element or page:**
+
+````js
+abp.ui.unblock();
+````
+
+## Options
+
+`abp.ui.block()` method can get an options object which may contain the following fields:
+
+* `elm`: An optional selector to find the element to be blocked (e.g. `#MyContainerId`). If not provided, the entire page is blocked. The selector can also be directly passed to the `block()` method as shown above.
+* `busy`: Set to `true` to show a progress indicator on the blocked area.
+* `promise`: A promise object with `always` or `finally` callbacks. This can be helpful if you want to automatically unblock the blocked area when a deferred operation completes.
+
+**Example: Block an element with busy indicator**
+
+````js
+abp.ui.block({
+  elm: '#MySection',
+  busy: true
+});
+````
+
+The resulting UI will look like below:
+
+![ui-busy](../../../images/ui-busy.png)
+
+## setBusy
+
+`abp.ui.setBusy(...)` and `abp.ui.clearBusy()` are shortcut functions if you want to use the block with `busy` option.
+
+**Example: Block with busy**
+
+````js
+abp.ui.setBusy('#MySection');
+````
+
+Then you can use `abp.ui.clearBusy();` to re-enable the busy area/page.
\ No newline at end of file
diff --git a/docs/en/UI/AspNetCore/JavaScript-API/Index.md b/docs/en/UI/AspNetCore/JavaScript-API/Index.md
index 281fa4726c..a41b57c80e 100644
--- a/docs/en/UI/AspNetCore/JavaScript-API/Index.md
+++ b/docs/en/UI/AspNetCore/JavaScript-API/Index.md
@@ -4,18 +4,16 @@ ABP provides a set of JavaScript APIs for ASP.NET Core MVC / Razor Pages applica
 
 ## APIs
 
-* [abp.ajax](Ajax.md)
-* [abp.auth](Auth.md)
-* [abp.currentUser](CurrentUser.md)
-* [abp.dom](DOM.md)
-* [abp.event](Events.md)
-* [abp.features](Features.md)
-* [abp.localization](Localization.md)
-* [abp.log](Logging.md)
-* [abp.message](Message.md)
-* [abp.notify](Notify.md)
-* abp.security
-* [abp.setting](Settings.md)
-* abp.ui
-* abp.utils
-* abp.ResourceLoader
\ No newline at end of file
+* [AJAX](Ajax.md)
+* [Auth](Auth.md)
+* [CurrentUser](CurrentUser.md)
+* [DOM](DOM.md)
+* [Events](Events.md)
+* [Features](Features.md)
+* [Localization](Localization.md)
+* [Logging](Logging.md)
+* ResourceLoader
+* [Settings](Settings.md)
+* [UI Block/Busy](Block-Busy.md)
+* [UI Message](Message.md)
+* [UI Notification](Notify.md)
\ No newline at end of file
diff --git a/docs/en/docs-nav.json b/docs/en/docs-nav.json
index 459c6947fd..14eedc65e7 100644
--- a/docs/en/docs-nav.json
+++ b/docs/en/docs-nav.json
@@ -483,6 +483,10 @@
                   "text": "Notify",
                   "path": "UI/AspNetCore/JavaScript-API/Notify.md"
                 },
+                {
+                  "text": "Block/Busy",
+                  "path": "UI/AspNetCore/JavaScript-API/Block-Busy.md"
+                },
                 {
                   "text": "Events",
                   "path": "UI/AspNetCore/JavaScript-API/Events.md"
diff --git a/docs/en/images/ui-busy.png b/docs/en/images/ui-busy.png
new file mode 100644
index 0000000000..63a1d7d74a
Binary files /dev/null and b/docs/en/images/ui-busy.png differ