diff --git a/examples/maqpy/needs_params.py b/examples/maqpy/needs_params.py
new file mode 100644
index 0000000..13e6f8b
--- /dev/null
+++ b/examples/maqpy/needs_params.py
@@ -0,0 +1,37 @@
+from replit import maqpy
+
+app = maqpy.App(__name__)
+
+
+@app.route("/")
+def index():
+    return """
+<html>
+<head><title>Form testing</title></head>
+<body>
+<h3>Form testing</h3>
+<form action="/form">
+    <button type=submit>Submit form with no parameter</button>
+</form>
+<form action="/form">
+    <input type=hidden name=param value=value>
+    <button type=submit>Submit form with parameter</button>
+</form>
+</body>
+</html>
+"""
+
+
+# custom onerror function
+def onerror(missing):
+    return f"Missing parameter {missing}"
+
+
+@app.route("/form")
+@maqpy.needs_params("param", onerror=onerror)
+def form(param):
+    return f"The value of param is: {param}"
+
+
+if __name__ == "__main__":
+    app.run()
