diff --git a/specification/resources/uptime/create_alert.yml b/specification/resources/uptime/create_alert.yml
index c3a87190..eda03022 100644
--- a/specification/resources/uptime/create_alert.yml
+++ b/specification/resources/uptime/create_alert.yml
@@ -34,6 +34,7 @@ requestBody:
           - name
           - type
           - notifications
+          - period
 
 responses:
   '201':
diff --git a/specification/resources/uptime/update_alert.yml b/specification/resources/uptime/update_alert.yml
index 08ad8391..1dc7c7ab 100644
--- a/specification/resources/uptime/update_alert.yml
+++ b/specification/resources/uptime/update_alert.yml
@@ -22,6 +22,12 @@ requestBody:
         allOf:
           - $ref: 'models/alert.yml#/alert_updatable'
 
+        required:
+          - name
+          - type
+          - notifications
+          - period
+
 responses:
   '200':
     $ref: 'responses/existing_alert.yml'