diff --git a/README.md b/README.md
index 377b897..01481ac 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,3 @@
-### Hello world
+### Start index
+
+Enter: `php -f ./index.php`
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..2640530
--- /dev/null
+++ b/index.php
@@ -0,0 +1,3 @@
+<?php
+
+echo "Hello world\n";