diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc960e581..e3a357757 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -46,6 +46,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added missing fields to `/_nodes/stats` ([#415](https://github.com/opensearch-project/opensearch-api-specification/pull/415))
 - Added missing metrics options to `/_nodes/stats` ([#422](https://github.com/opensearch-project/opensearch-api-specification/pull/422))
 - Added tests against OpenSearch 1.3 ([#424](https://github.com/opensearch-project/opensearch-api-specification/pull/424))
+- Added `is_hidden` to `/{index}/_alias/{name}` and `/{index}/_aliases/{name}` ([#429](https://github.com/opensearch-project/opensearch-api-specification/pull/429))
 
 ### Changed
 
diff --git a/spec/namespaces/indices.yaml b/spec/namespaces/indices.yaml
index dc113533b..99895bbea 100644
--- a/spec/namespaces/indices.yaml
+++ b/spec/namespaces/indices.yaml
@@ -1860,6 +1860,12 @@ components:
                 $ref: '../schemas/_common.yaml#/components/schemas/Routing'
               search_routing:
                 $ref: '../schemas/_common.yaml#/components/schemas/Routing'
+              is_hidden:
+                x-version-added: '2.16'
+                description: |-
+                  If `true`, the alias will be hidden`.
+                type: boolean
+                default: false
             description: The settings for the alias, such as `routing` or `filter`
     indices.put_index_template:
       content:
diff --git a/tests/indices/aliases.yaml b/tests/indices/aliases.yaml
index f9d7dc485..1e28a2638 100644
--- a/tests/indices/aliases.yaml
+++ b/tests/indices/aliases.yaml
@@ -73,3 +73,33 @@ chapters:
     parameters:
       index: games
       name: plays2
+  - synopsis: Create an alias by Create or Update alias endpoint.
+    path: /{index}/_alias/{name}
+    method: PUT
+    parameters:
+      index: games
+      name: jeux
+  - synopsis: Create an alias with custom settings by Create or Update alias endpoint.
+    path: /{index}/_alias/{name}
+    method: PUT
+    parameters:
+      index: games
+      name: jeux
+    request_body:
+      payload:
+        index_routing: test1
+        search_routing: test2
+        routing: test
+        is_write_index: true
+        filter:
+          match_all: {}
+  - synopsis: Create an alias with is_hidden by Create or Update alias endpoint.
+    version: '>= 2.16'
+    path: /{index}/_alias/{name}
+    method: PUT
+    parameters:
+      index: games
+      name: jeux
+    request_body:
+      payload:
+        is_hidden: true