diff --git a/src/rda_python_template/__init__.py b/src/rda_python_template/__init__.py
index 8b13789..5becc17 100644
--- a/src/rda_python_template/__init__.py
+++ b/src/rda_python_template/__init__.py
@@ -1 +1 @@
-
+__version__ = "1.0.0"
diff --git a/src/rda_python_template/hello_world.py b/src/rda_python_template/hello_world.py
index 15e0c12..4ca5d7d 100644
--- a/src/rda_python_template/hello_world.py
+++ b/src/rda_python_template/hello_world.py
@@ -1 +1,7 @@
-print("hello Workd!")
+def main():
+  print("hello Workd!")
+
+#
+# call main() to start program
+#
+if __name__ == "__main__": main()