diff --git a/NEWS.md b/NEWS.md
index 1bc37e0..9386a0c 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,3 @@
 # mcmcderive 0.0.1
 
-* Added a `NEWS.md` file to track changes to the package.
+* Optimized `mcmc_derive()`.
diff --git a/docs/news/index.html b/docs/news/index.html
index db6aada..91f0101 100644
--- a/docs/news/index.html
+++ b/docs/news/index.html
@@ -111,7 +111,7 @@ <h1>Changelog <small></small></h1>
 <h1 class="page-header">
 <a href="#mcmcderive-001" class="anchor"></a>mcmcderive 0.0.1</h1>
 <ul>
-<li>Added a <code>NEWS.md</code> file to track changes to the package.</li>
+<li>Optimized <code><a href="../reference/mcmc_derive.html">mcmc_derive()</a></code>.</li>
 </ul>
 </div>
   </div>
diff --git a/docs/reference/mcmcderive-package.html b/docs/reference/mcmcderive-package.html
index 3e72bf1..08bed60 100644
--- a/docs/reference/mcmcderive-package.html
+++ b/docs/reference/mcmcderive-package.html
@@ -36,8 +36,9 @@
 
 <meta property="og:description" content="Generates derived parameter(s) from Monte Carlo Markov Chain (MCMC) 
     samples using R code. This allows Bayesian models to be fitted without the 
-    inclusion of derived parameters which add unnecessary complexity and 
-    slow model fitting." />
+    inclusion of derived parameters which add unnecessary clutter and 
+    slow model fitting. For more information on MCMC samples see 
+    Brooks et al. (2011) &amp;lt;isbn:978-1-4200-7941-8&amp;gt;." />
 <meta name="twitter:card" content="summary" />
 
 
@@ -118,8 +119,9 @@ <h1>mcmcderive: Derive MCMC Parameters</h1>
     
     <p>Generates derived parameter(s) from Monte Carlo Markov Chain (MCMC) 
     samples using R code. This allows Bayesian models to be fitted without the 
-    inclusion of derived parameters which add unnecessary complexity and 
-    slow model fitting.</p>
+    inclusion of derived parameters which add unnecessary clutter and 
+    slow model fitting. For more information on MCMC samples see 
+    Brooks et al. (2011) &lt;isbn:978-1-4200-7941-8&gt;.</p>
     
     </div>