diff --git a/Jenkinsfile b/Jenkinsfile
index 6fe2cb6..af8e16d 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,10 +1,15 @@
 pipeline {
     agent any
 
+    parameters {
+        string(name: 'ROLLBACK_TAG', defaultValue: '',
+               description: 'Khaali = normal build. Purana build number (jaise 2) = seedha us image par rollback, bina rebuild ke')
+    }
+
     environment {
         REGISTRY   = '51.195.4.170:5000'
         IMAGE_NAME = 'swim/demo-app'
-        IMAGE_TAG  = "${env.BUILD_NUMBER}"
+        IMAGE_TAG  = "${params.ROLLBACK_TAG?.trim() ? params.ROLLBACK_TAG : env.BUILD_NUMBER}"
         // Jenkins container ke andar workspace /var/jenkins_home/... hai,
         // par docker daemon HOST par chalta hai jahan wahi folder
         // /opt/devops/data/jenkins/... par hai. -v ke liye HOST ka path chahiye.
@@ -27,6 +32,7 @@ pipeline {
         }
 
         stage('Test') {
+            when { expression { !params.ROLLBACK_TAG?.trim() } }
             steps {
                 sh '''
                     # container ka path -> host ka path badlo
@@ -43,6 +49,7 @@ pipeline {
         }
 
         stage('Build image') {
+            when { expression { !params.ROLLBACK_TAG?.trim() } }
             steps {
                 sh '''
                     docker build \
@@ -55,6 +62,7 @@ pipeline {
         }
 
         stage('Smoke test image') {
+            when { expression { !params.ROLLBACK_TAG?.trim() } }
             steps {
                 sh '''
                     CID=$(docker run -d -P ${REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG})
@@ -71,6 +79,7 @@ assert r['version'] == '${IMAGE_TAG}', 'version galat!'
         }
 
         stage('Push to registry') {
+            when { expression { !params.ROLLBACK_TAG?.trim() } }
             steps {
                 withCredentials([usernamePassword(credentialsId: 'registry-creds',
                                                   usernameVariable: 'REG_USER',