diff --git a/changelogs/unreleased/57101-api-docs-for-hangouts-chat-service-incorrect.yml b/changelogs/unreleased/57101-api-docs-for-hangouts-chat-service-incorrect.yml
new file mode 100644
index 00000000000..2e0ae9c3732
--- /dev/null
+++ b/changelogs/unreleased/57101-api-docs-for-hangouts-chat-service-incorrect.yml
@@ -0,0 +1,5 @@
+---
+title: 'API: Fix docs and parameters for hangouts-chat service'
+merge_request: 25180
+author: Robert Schilling
+type: fixed
diff --git a/doc/api/services.md b/doc/api/services.md
index 2a8ce39e570..5d5aa3e5b3e 100644
--- a/doc/api/services.md
+++ b/doc/api/services.md
@@ -412,7 +412,7 @@ Google GSuite team collaboration tool.
 Set Hangouts Chat service for a project.
 
 ```
-PUT /projects/:id/services/hangouts_chat
+PUT /projects/:id/services/hangouts-chat
 ```
 
 >**Note:** Specific event parameters (e.g. `push_events` flag) were [introduced in v10.4][11435]
@@ -438,7 +438,7 @@ Parameters:
 Delete Hangouts Chat service for a project.
 
 ```
-DELETE /projects/:id/services/hangouts_chat
+DELETE /projects/:id/services/hangouts-chat
 ```
 
 ### Get Hangouts Chat service settings
@@ -446,7 +446,7 @@ DELETE /projects/:id/services/hangouts_chat
 Get Hangouts Chat service settings for a project.
 
 ```
-GET /projects/:id/services/hangouts_chat
+GET /projects/:id/services/hangouts-chat
 ```
 
 ## Irker (IRC gateway)
diff --git a/lib/api/services.rb b/lib/api/services.rb
index 36bdba2d765..163c7505a65 100644
--- a/lib/api/services.rb
+++ b/lib/api/services.rb
@@ -368,8 +368,9 @@ module API
           name: :webhook,
           type: String,
           desc: 'The Hangouts Chat webhook. e.g. https://chat.googleapis.com/v1/spaces…'
-        }
-      ],
+        },
+        CHAT_NOTIFICATION_EVENTS
+      ].flatten,
       'irker' => [
         {
           required: true,