diff --git a/README.md b/README.md
index 762cd77..ad35895 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ func fileproviderSucceed(_ fileProvider: FileProviderOperations, operation: File
 	case .remove(path: let path):
 		print("\(path) has been deleted.")
 	default:
-		print("\(operation.actionDescription) from \(operation.source ?? "") to \(operation.destination) succeed")
+		print("\(operation.actionDescription) from \(operation.source!) to \(operation.destination) succeed")
 	}
 }
 
@@ -149,7 +149,7 @@ func fileproviderFailed(_ fileProvider: FileProviderOperations, operation: FileO
 	case .remove:
 		print("file can't be deleted.")
 	default:
-		print("\(operation.actionDescription) from \(operation.source ?? "") to \(operation.destination) failed")
+		print("\(operation.actionDescription) from \(operation.source!) to \(operation.destination) failed")
 	}
 }