diff --git a/api/client-server/v2_alpha/filter.yaml b/api/client-server/v2_alpha/filter.yaml
index 115ef230..f53ef2ba 100644
--- a/api/client-server/v2_alpha/filter.yaml
+++ b/api/client-server/v2_alpha/filter.yaml
@@ -100,13 +100,18 @@ paths:
           description: |-
             The user ID to download a filter for.
           x-example: "@alice:example.com"
+          required: true
         - in: path
           name: filterId
+          type: string
           description: |-
             The filter ID to download.
           x-example: "66696p746572"
+          required: true
       responses:
         200:
+          description: |-
+            "The filter defintion"
           examples:
             application/json: |-
               {
diff --git a/jenkins.sh b/jenkins.sh
index e1043644..0936de9d 100755
--- a/jenkins.sh
+++ b/jenkins.sh
@@ -5,5 +5,5 @@ set -ex
 (cd event-schemas/ && ./check_examples.py)
 (cd api && ./check_examples.py)
 (cd scripts && ./gendoc.py)
-(cd api && npm install && node validator.js -s "client-server/v1")
+(cd api && npm install && node validator.js -s "client-server/v1" && node validator.js -s "client-server/v2_alpha")
 (cd event-schemas/ && ./check.sh)