diff --git a/src/init/preface.html b/src/init/preface.html
index 920ad1b..e57d9d0 100644
--- a/src/init/preface.html
+++ b/src/init/preface.html
@@ -1,10 +1,16 @@
 <!doctype html>
 <html lang="en">
+
 <head>
-	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
-	<title>Category Theory for Programmers: The Preface</title>
+	<meta charset="utf-8"/>
+	<meta name="author" content="Bartosz Milewski"/>
+	<meta name="description" content="Introduction to category theory"/>
+	<meta name="keywords" content="Category Theory, Functional Programming, Haskell, C++"/>
+	<meta name="date" content="September 9, 2017"/>
+  <title>Category Theory for Programmers</title>
   <link rel="stylesheet" href="../style.css">
 </head>
+
 <body>
   <h1>Preface</h1>
   <blockquote>
@@ -30,4 +36,5 @@
     <figcaption>Ad hoc measures preventing the Beauvais cathedral from collapsing.</figcaption>
   </figure>
 </body>
+
 </html>
