diff --git a/Jenkinsfile-lab6_1 b/Jenkinsfile-lab6_1
index 43cbda0..1078bae 100644
--- a/Jenkinsfile-lab6_1
+++ b/Jenkinsfile-lab6_1
@@ -2,6 +2,13 @@ pipeline {
     agent {
         dockerfile true 
     }
+    parameters {
+     buildSelector (
+         name: 'BUILD_SELECTOR',
+         defaultSelector: lastSuccessful(),
+         description: 'no',       
+        )
+    }
 
     stages {
         stage('do nothing')