Small typo

Author: jackiedorland

site/index.html

@@ -82,7 +82,7 @@ <h2>Why Haskell?</h2>
       <div class=" row ">
          <div class=" span6 col-md-6">
             <h3>A new paradigm</h3>
-            <p>Express your ideas clearly and learn a new way of thinking about programming. Based on lambda calculus Haskell is a
+            <p>Express your ideas clearly and learn a new way of thinking about programming. Based on lambda calculus, Haskell is a
             purely functional programming language that features referential transparency, immutability and lazy evaluation.
             Concepts that will blow your mind
                &mdash; relearn programming while having an absolute blast.