diff --git a/apis/beacon/states/validator_balances.yaml b/apis/beacon/states/validator_balances.yaml
index c68b208c..a04089a6 100644
--- a/apis/beacon/states/validator_balances.yaml
+++ b/apis/beacon/states/validator_balances.yaml
@@ -52,6 +52,15 @@ get:
             example:
               code: 400
               message: "Invalid state ID: current"
+    "414":
+      description: "Too many validator IDs"
+      content:
+        application/json:
+          schema:
+            $ref: "../../../beacon-node-oapi.yaml#/components/schemas/ErrorMessage"
+            example:
+              code: 414
+              message: "Too many validator IDs in request"
     "500":
       $ref: '../../../beacon-node-oapi.yaml#/components/responses/InternalError'
 
diff --git a/apis/beacon/states/validators.yaml b/apis/beacon/states/validators.yaml
index de7ba26b..855dd5b0 100644
--- a/apis/beacon/states/validators.yaml
+++ b/apis/beacon/states/validators.yaml
@@ -72,5 +72,14 @@ get:
             example:
               code: 404
               message: "State not found"
+    "414":
+      description: "Too many validator IDs"
+      content:
+        application/json:
+          schema:
+            $ref: "../../../beacon-node-oapi.yaml#/components/schemas/ErrorMessage"
+            example:
+              code: 414
+              message: "Too many validator IDs in request"
     "500":
       $ref: "../../../beacon-node-oapi.yaml#/components/responses/InternalError"