diff --git a/CHANGELOG.md b/CHANGELOG.md
index efaa9f8d82df446de761728bf8b345e6a30c5726..0eb781f0c85adc4152225701c6e5af053e0cf841 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ The format is based on [keep a changelog](http://keepachangelog.com) and this pr
 - Option for read-only globals in Lua runtime to reduce memory footprint. Enabled by default.
 - Independent config flags for socket read and write buffer sizes.
 - Expose session fields in authoritative match join attempt contexts.
+- Add group ID to content of in-app notifications relating to groups.
 
 ### Changed
 - Replace metrics implementation.
diff --git a/server/core_group.go b/server/core_group.go
index 73b3caa8af10aa05d34854d4118c4dccd49ad85f..956fd5d7e1dae4f2158cdad35ea17c8292bc96fd 100644
--- a/server/core_group.go
+++ b/server/core_group.go
@@ -319,7 +319,7 @@ WHERE (id = $1) AND (disable_time = '1970-01-01 00:00:00 UTC')`
 
 		// If it's a private group notify superadmins/admins that someone has requested to join.
 		// Prepare notification data.
-		notificationContentBytes, err := json.Marshal(map[string]string{"username": username})
+		notificationContentBytes, err := json.Marshal(map[string]string{"group_id": groupID.String(), "username": username})
 		if err != nil {
 			logger.Error("Could not encode notification content.", zap.Error(err))
 		} else {
@@ -580,7 +580,7 @@ func AddGroupUsers(ctx context.Context, logger *zap.Logger, db *sql.DB, router M
 	}
 
 	// Prepare notification data.
-	notificationContentBytes, err := json.Marshal(map[string]string{"name": groupName.String})
+	notificationContentBytes, err := json.Marshal(map[string]string{"group_id": groupID.String(), "name": groupName.String})
 	if err != nil {
 		logger.Error("Could not encode notification content.", zap.Error(err))
 		return err