diff --git a/src/NBomber.Contracts/Contracts.fs b/src/NBomber.Contracts/Contracts.fs
index 942d619..c455df0 100644
--- a/src/NBomber.Contracts/Contracts.fs
+++ b/src/NBomber.Contracts/Contracts.fs
@@ -93,6 +93,7 @@ type IScenarioContext =
     abstract Logger: ILogger
     abstract InvocationNumber: int64    
     abstract Data: Dictionary<string,obj>
+    abstract Random: Random
     abstract StopScenario: scenarioName:string * reason:string -> unit
     abstract StopCurrentTest: reason:string -> unit