diff --git a/crates/ptth_relay/src/lib.rs b/crates/ptth_relay/src/lib.rs
index d3fcaf9..a6da42e 100644
--- a/crates/ptth_relay/src/lib.rs
+++ b/crates/ptth_relay/src/lib.rs
@@ -354,6 +354,9 @@ async fn handle_all (
 			Ok (error_reply (StatusCode::BAD_REQUEST, "Bad URI format")?)
 		}
 	}
+	else if let Some (rest) = prefix_match ("/frontend/debug/", &path) {
+		Ok (error_reply (StatusCode::NOT_IMPLEMENTED, "Not implemented (yet)")?)
+	}
 	else if path == "/" {
 		let s = handlebars.render ("relay_root", &())?;
 		Ok (ok_reply (s)?)
diff --git a/handlebars/relay/debug.hbs b/handlebars/relay/debug.hbs
new file mode 100644
index 0000000..c8c7080
--- /dev/null
+++ b/handlebars/relay/debug.hbs
@@ -0,0 +1,44 @@
+<html>
+<head>
+<meta charset="utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<link href="data:image/x-icon;base64,AAABAAEAEBAQAAEABAAoAQAAFgAAACgAAAAQAAAAIAAAAAEABAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAlJSUAAGIAAP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAAAIiIiIgAAAAAAAAAgAAAAAAAAAAAAADIiIiIi
+IiIjMhERERERESMyERERERERIzIREREREREjMhERIRERESMyERIiIiERIzIRESEREREjMhERERER
+ESMyERERERERIzIREREREREjMiIiIiIiIiMAAAAAAAAAAAAAAAAAAAAAAAAAAIABAACAAQAAgAEA
+AIABAACAAQAAgAEAAIABAACAAQAAgAEAAIABAACAAQAA" rel="icon" type="image/x-icon" />
+<style>
+	body {
+		font-family: sans-serif;
+	}
+	td {
+		padding: 0px;
+	}
+	td > * {
+		padding: 20px;
+		display: block;
+	}
+	.entry {
+		
+	}
+	.grey {
+		color: #888;
+		text-align: right;
+	}
+	.entry_list {
+		width: 100%;
+		border-collapse: collapse;
+	}
+	tbody tr:nth-child(odd) {
+		background-color: #ddd;
+	}
+</style>
+<title>ptth_relay debugging tools</title>
+</head>
+<body>
+
+<h1>ptth_relay debugging tools</h1>
+
+</body>
+</html>
diff --git a/handlebars/relay/relay_root.html b/handlebars/relay/relay_root.html
index 79c7d30..98391fa 100644
--- a/handlebars/relay/relay_root.html
+++ b/handlebars/relay/relay_root.html
@@ -27,6 +27,10 @@
 <a class="entry" href="frontend/servers/">Server list</a>
 </div>
 
+<div>
+<a class="entry" href="frontend/debug/">Debugging tools</a>
+</div>
+
 </div>
 
 </body>
diff --git a/todo.md b/todo.md
index e793417..48af195 100644
--- a/todo.md
+++ b/todo.md
@@ -1,6 +1,7 @@
 Interesting issues will get a unique ID with
 `dd if=/dev/urandom bs=5 count=1 | base32`
 
+- Add endless virtual files for debugging
 - Fix long-running downloads restarting in the middle
 - [DMX6CO4G](issues/2021-01Jan/status-DMX6CO4G.md) fire-and-forget logs / key-value status data
 - ptth_tail
