diff --git a/src/activities/Elsa.Activities.File/Activities/WatchDirectory/WatchDirectory.cs b/src/activities/Elsa.Activities.File/Activities/WatchDirectory/WatchDirectory.cs
index ea8bd9e18..7a498965a 100644
--- a/src/activities/Elsa.Activities.File/Activities/WatchDirectory/WatchDirectory.cs
+++ b/src/activities/Elsa.Activities.File/Activities/WatchDirectory/WatchDirectory.cs
@@ -18,6 +18,9 @@ namespace Elsa.Activities.File
         [ActivityInput(Hint = "The path of the directory to watch")]
         public string Path { get; set; }
 
+        [ActivityInput(Hint = "The file pattern for interested files")]
+        public string Pattern { get; set; }
+
         protected override IActivityExecutionResult OnExecute(ActivityExecutionContext context)
         {
             return base.OnExecute(context);