diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1d18fe0..101adc8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,12 +1,13 @@
-name: Simple Workflow
-
-on: [push] # triggers when code is pushed
-
+---
+name: basic workflow
+on:
+  pull_request:
+    branches:
+      - main
 jobs:
-  demo-job:
-    runs-on: ubuntu-latest
+  build:
+    runs-on: ubuntu-24.04
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v5
-      - name: Say Hello
-        run: echo "Hello from GitHub Actions!"
+      - name: lowlevel command
+        run: echo hello
+        
\ No newline at end of file
diff --git a/README.md b/README.md
index c4fc40b..5bbbf51 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-yes i want to readme.md file  is update
+yes i want to readme.md file  is update ####