diff --git a/docs/demo/demo.cast b/docs/demo/demo.cast
new file mode 100644
index 0000000..ee5dd28
--- /dev/null
+++ b/docs/demo/demo.cast
@@ -0,0 +1,12 @@
+Set Shell zsh
+Set FontSize 11
+Escape
+Type "[200~go run ./turtle/ slowloris http://localhost:8889 --http-send-gibberish"
+Escape
+Type "[201~"
+Enter
+Sleep 30s
+Type "q"
+Sleep 3s
+Ctrl+D
+Output demo.gif
diff --git a/docs/demo/demo.gif b/docs/demo/demo.gif
index 987dddb..df0f6cb 100644
Binary files a/docs/demo/demo.gif and b/docs/demo/demo.gif differ