diff --git a/src/404.md b/src/404.md
new file mode 100644
index 0000000..46e4afd
--- /dev/null
+++ b/src/404.md
@@ -0,0 +1,8 @@
+---
+permalink: 404.html
+eleventyExcludeFromCollections: true
+---
+
+# Content not found.
+
+Sorry, can't find this page. Return [home](/).