diff --git a/openapi.yaml b/openapi.yaml
index d594e70a..a4dbb17a 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -152,7 +152,10 @@ components:
           default: 0
         collateral:
           type: string
-          description: Hexadecimal encoded number that represents how much collateral is asked from hosts that wants to fill a slots
+          description: Number as decimal string that represents how much collateral is asked from hosts that wants to fill a slots
+        expiry:
+          type: string
+          description: Number as decimal string that represents expiry time of the request (in unix timestamp)
 
     StorageAsk:
       type: object