diff --git a/lecture6.html b/lecture6.html
index 2a2bb59..1eb5043 100644
--- a/lecture6.html
+++ b/lecture6.html
@@ -575,7 +575,7 @@ <h1>Concurrency Control Protocol</h1>
   <div class="slide outline"></div>
 
   <section>
-    <header>Richardson Maturiy Model</header>
+    <header>Richardson Maturity Model</header>
 
     <div class="slide">
       <hgroup>
@@ -583,7 +583,7 @@ <h1>Steps towards REST</h1>
       </hgroup>
       <img src="img/maturity-model.png" style="margin-top: 40px; margin-left: 50px"></img>
       <ul class="xx-small">
-        <li class="no-bullet">See <span class="h-ref" id="rmm">Richardson Maturiy Model</span> details.</li>
+        <li class="no-bullet">See <span class="h-ref" id="rmm">Richardson Maturity Model</span> details.</li>
       </ul>
     </div>