diff --git a/sfd.typ b/sfd.typ
new file mode 100644
index 0000000..cfa63b0
--- /dev/null
+++ b/sfd.typ
@@ -0,0 +1,25 @@
+// templates for online lecture notes
+
+#import "main.typ": gen_title, gen_authors, doc_template, mono_font
+
+#let template(
+  title: none,
+  authors: none,
+  lecture_url: none,
+  body
+) = {
+  doc_template({
+    gen_title(title: title)
+    if lecture_url != none {
+      v(10pt, weak: true)
+      align(center, {
+        text(scale(link(lecture_url)), size: 0.9em, font: mono_font)
+        v(10pt, weak: true)
+      })
+    }
+    v(15pt, weak: true)
+
+    gen_authors(authors: authors)
+    body
+  })
+}