diff --git a/.github/workflows/basic-workflow.yml b/.github/workflows/basic-workflow.yml
index 04785de..1c478c8 100644
--- a/.github/workflows/basic-workflow.yml
+++ b/.github/workflows/basic-workflow.yml
@@ -1,17 +1,22 @@
 name: Continuous integration example
 
 on: 
-  push:
+  workflow_dispatch:
 
 jobs:
-
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+          fail-fast: false
+          matrix:
+            os: [ macos-latest, windows-latest, ubuntu-latest ]
+            java: [ '11', '17', '21']
+    name: Java ${{ matrix.java }} sample
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 21
+      - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: ${{ matrix.java }}
       - run: mvn test
diff --git a/README.md b/README.md
index a0fa09a..34ea9b0 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
 # Ejemplo de Integración Continua con GitHub Actions
 
-Este proyecto ofrece una Calculadora hecha en Java
+Este proyecto ofrece una Calculadora hecha en Java, que bien