diff --git a/_src/_includes/snippets/commands/options.html b/_src/_includes/snippets/commands/options.html
index bd0ecfc..a16a6a8 100644
--- a/_src/_includes/snippets/commands/options.html
+++ b/_src/_includes/snippets/commands/options.html
@@ -46,6 +46,11 @@
             <td>Show a directory listing for the server</td>
         </tr>
 
+        <tr>
+            <td>--extensions</td>
+            <td>Specify file extension fallbacks</td>
+        </tr>
+
         <tr>
             <td>--proxy</td>
             <td>Proxy an existing server</td>
diff --git a/_src/_includes/snippets/options/server.js b/_src/_includes/snippets/options/server.js
index 81d647c..910ebff 100644
--- a/_src/_includes/snippets/options/server.js
+++ b/_src/_includes/snippets/options/server.js
@@ -20,6 +20,12 @@ server: {
     index: "index.htm"
 }
 
+// Serve files from the app directory, with custom file extension fallbacks
+server: {
+    baseDir: "app",
+    extensions: ["html","json"]
+}
+
 // Since version 1.2.1
 // The key is the url to match
 // The value is which folder to serve (relative to your current working directory)
diff --git a/docs/command-line/index.html b/docs/command-line/index.html
index a93c276..6ca4650 100644
--- a/docs/command-line/index.html
+++ b/docs/command-line/index.html
@@ -119,6 +119,11 @@ <h3 id="command-line-options" class="section-link">
                                 <td>Show a directory listing for the server</td>
                             </tr>
 
+                            <tr>
+                                <td>--extensions</td>
+                                <td>Specify file extension fallbacks</td>
+                            </tr>
+
                             <tr>
                                 <td>--proxy</td>
                                 <td>Proxy an existing server</td>
@@ -191,6 +196,7 @@ <h3 id="command-line-options" class="section-link">
 
                     </table>
 
+
                     <h3 id="files-example" class="section-link">
                         <a href="#files-example" class="page-anchor">Files Examples</a>
                         <a href="#page-top" class="back-to-top">^ TOP</a>
diff --git a/docs/options/index.html b/docs/options/index.html
index e52281e..11580e5 100644
--- a/docs/options/index.html
+++ b/docs/options/index.html
@@ -237,6 +237,12 @@ <h3 id="option-server" class="section-link">
     index: <span class="hljs-string">"index.htm"</span>
 }
 
+<span class="hljs-comment">// Serve files from the app directory, with custom file extension fallbacks</span>
+server: {
+    baseDir: <span class="hljs-string">"app"</span>,
+    extensions: [<span class="hljs-string">"html"</span>,<span class="hljs-string">"json"</span>]
+}
+
 <span class="hljs-comment">// Since version 1.2.1</span>
 <span class="hljs-comment">// The key is the url to match</span>
 <span class="hljs-comment">// The value is which folder to serve (relative to your current working directory)</span>