diff --git a/.eleventy.js b/.eleventy.js
index b2f39d6..177cbf2 100644
--- a/.eleventy.js
+++ b/.eleventy.js
@@ -7,12 +7,15 @@ const markdownIt = require("markdown-it");
 const markdownItAnchor = require("markdown-it-anchor");
 
 module.exports = function(eleventyConfig) {
+  // Add plugins
   eleventyConfig.addPlugin(pluginRss);
   eleventyConfig.addPlugin(pluginSyntaxHighlight);
   eleventyConfig.addPlugin(pluginNavigation);
 
+  // https://www.11ty.dev/docs/data-deep-merge/
   eleventyConfig.setDataDeepMerge(true);
 
+  // Alias `layout: post` to `layout: layouts/post.njk`
   eleventyConfig.addLayoutAlias("post", "layouts/post.njk");
 
   eleventyConfig.addFilter("readableDate", dateObj => {
@@ -33,43 +36,32 @@ module.exports = function(eleventyConfig) {
     return array.slice(0, n);
   });
 
+  // Return the smallest number argument
   eleventyConfig.addFilter("min", (...numbers) => {
     return Math.min.apply(null, numbers);
   });
 
+  // Create an array of all tags
   eleventyConfig.addCollection("tagList", function(collection) {
     let tagSet = new Set();
     collection.getAll().forEach(function(item) {
       if( "tags" in item.data ) {
         let tags = item.data.tags;
 
-        tags = tags.filter(function(item) {
-          switch(item) {
-            // this list should match the `filter` list in tags.njk
-            case "all":
-            case "nav":
-            case "post":
-            case "posts":
-              return false;
-          }
-
-          return true;
-        });
-
-        for (const tag of tags) {
-          tagSet.add(tag);
-        }
+        // this list should match the `filter` list in tags.njk
+        tags.filter(tag => ["all", "nav", "post", "posts"].indexOf(tag) === -1)
+          .forEach(tag => tagSet.add(tag));
       }
     });
 
-    // returning an array in addCollection works in Eleventy 0.5.3
     return [...tagSet];
   });
 
+  // Copy the `img` and `css` folders to the output
   eleventyConfig.addPassthroughCopy("img");
   eleventyConfig.addPassthroughCopy("css");
 
-  /* Markdown Overrides */
+  // Customize Markdown library and settings:
   let markdownLibrary = markdownIt({
     html: true,
     breaks: true,
@@ -81,7 +73,7 @@ module.exports = function(eleventyConfig) {
   });
   eleventyConfig.setLibrary("md", markdownLibrary);
 
-  // Browsersync Overrides
+  // Override Browsersync defaults (used only with --serve)
   eleventyConfig.setBrowserSyncConfig({
     callbacks: {
       ready: function(err, browserSync) {
@@ -100,6 +92,8 @@ module.exports = function(eleventyConfig) {
   });
 
   return {
+    // Control which files Eleventy will process
+    // e.g.: *.md, *.njk, *.html, *.liquid
     templateFormats: [
       "md",
       "njk",
@@ -107,21 +101,30 @@ module.exports = function(eleventyConfig) {
       "liquid"
     ],
 
-    // If your site lives in a different subdirectory, change this.
-    // Leading or trailing slashes are all normalized away, so don’t worry about those.
+    // -----------------------------------------------------------------
+    // If your site deploys to a subdirectory, change `pathPrefix`.
+    // Don’t worry about leading and trailing slashes, we normalize these.
 
     // If you don’t have a subdirectory, use "" or "/" (they do the same thing)
     // This is only used for link URLs (it does not affect your file structure)
     // Best paired with the `url` filter: https://www.11ty.dev/docs/filters/url/
 
     // You can also pass this in on the command line using `--pathprefix`
-    // pathPrefix: "/",
 
+    // Optional (default is shown)
+    pathPrefix: "/",
+    // -----------------------------------------------------------------
+
+    // Pre-process *.md files with: (default: `liquid`)
     markdownTemplateEngine: "liquid",
-    htmlTemplateEngine: "njk",
-    dataTemplateEngine: "njk",
 
-    // These are all optional, defaults are shown:
+    // Pre-process *.html files with: (default: `liquid`)
+    htmlTemplateEngine: "njk",
+
+    // Opt-out of pre-processing global data JSON files: (default: `liquid`)
+    dataTemplateEngine: false,
+
+    // These are all optional (defaults are shown):
     dir: {
       input: ".",
       includes: "_includes",
diff --git a/_includes/layouts/post.njk b/_includes/layouts/post.njk
index 2c046b3..83eae7a 100644
--- a/_includes/layouts/post.njk
+++ b/_includes/layouts/post.njk
@@ -6,10 +6,12 @@ templateClass: tmpl-post
 
 {{ content | safe }}
 
+{%- set nextPost = collections.posts | getNextCollectionItem(page) %}
+{%- set previousPost = collections.posts | getPreviousCollectionItem(page) %}
+{% if nextPost or previousPost %}
 <hr>
 <ul>
-  {%- set nextPost = collections.posts | getNextCollectionItem(page) %}
   {%- if nextPost %}<li>Next: <a href="{{ nextPost.url | url }}">{{ nextPost.data.title }}</a></li>{% endif %}
-  {%- set previousPost = collections.posts | getPreviousCollectionItem(page) %}
   {%- if previousPost %}<li>Previous: <a href="{{ previousPost.url | url }}">{{ previousPost.data.title }}</a></li>{% endif %}
 </ul>
+{% endif %}
diff --git a/index.njk b/index.njk
index d492062..bf096f7 100644
--- a/index.njk
+++ b/index.njk
@@ -4,7 +4,6 @@ eleventyNavigation:
   key: Home
   order: 1
 ---
-
 {% set maxPosts = collections.posts.length | min(3) %}
 <h1>Latest {% if maxPosts == 1 %}Post{% else %}{{ maxPosts }} Posts{% endif %}</h1>
 
diff --git a/package.json b/package.json
index 65bfc56..2168fd7 100644
--- a/package.json
+++ b/package.json
@@ -27,8 +27,8 @@
     "@11ty/eleventy": "^0.11.1",
     "@11ty/eleventy-navigation": "^0.1.6",
     "@11ty/eleventy-plugin-rss": "^1.1.0",
-    "@11ty/eleventy-plugin-syntaxhighlight": "^3.0.6",
-    "luxon": "^1.25.0",
+    "@11ty/eleventy-plugin-syntaxhighlight": "^3.1.0",
+    "luxon": "^1.26.0",
     "markdown-it": "^8.4.2",
     "markdown-it-anchor": "^5.2.5"
   }