diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7301f09
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+# python-sample
+The simplest posible webapp in flask. 
+This app responds to GET requests at / printing  'Hello World from {APP_NAME}!', where APP_NAME is optional and it is read from an environment variable.
+It's compatible with python 3.8+.  
diff --git a/app.py b/app.py
index f64c9e7..4b5c2f2 100644
--- a/app.py
+++ b/app.py
@@ -5,9 +5,10 @@
 
 @app.route('/')
 def hello():
-    return 'Hello World!'
+    app_name = os.environ.get('APP_NAME', '[set APP_NAME env var]')
+    return 'Hello World from {}!'.format(app_name)
 
 if __name__ == '__main__':
     # Bind to PORT if defined, otherwise default to 5000.
     port = int(os.environ.get('PORT', 5000))
-    app.run(host='0.0.0.0', port=port)
\ No newline at end of file
+    app.run(host='0.0.0.0', port=port)
diff --git a/requirements.txt b/requirements.txt
index 0382aa2..e4c5de6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
-Flask==0.9
-Jinja2==2.6
-Werkzeug==0.8.3
-wsgiref==0.1.2
+click==7.1.2
+Flask==1.1.2
+itsdangerous==1.1.0
+Jinja2==2.11.3
+MarkupSafe==1.1.1
+Werkzeug==1.0.1