diff --git a/404.html b/404.html
new file mode 100644
index 0000000..27a56ec
--- /dev/null
+++ b/404.html
@@ -0,0 +1,3 @@
+<h1>404</h1>
+
+<p>Page not found. You can find the list of pages in the <a href="https://github.com/Mkaysi/mkaysi.github.com/">source.</a></p>
diff --git a/404.html.md b/404.html.md
new file mode 100644
index 0000000..654a8a2
--- /dev/null
+++ b/404.html.md
@@ -0,0 +1,4 @@
+404
+===
+
+Page not found. You can find the list of pages in the [source.](https://github.com/Mkaysi/mkaysi.github.com/)