diff --git a/.gitignore b/.gitignore
index 288654e6..6ba60baf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,20 @@
-node_modules
-data
-locales
-images/latex/source
-components/sections/**/index.js
-!components/sections/index.js
+# nonsense files and dirs:
 .buildmark
 npm-debug.log
+node_modules
+
+# the locale data is transient, and only used during build
+locales
+
+# The latex source files are similarly transient
+images/latex/source
+
+# each section's index.js is autogenerated and doesn't need to be checked in
+components/sections/**/index.js
+
+# but NOT these two! These absolutely need checking in.
+!components/sections/index.js
+!components/sections/comments/index.js
+
 # this gets to be here for as long as I've not figured out how to do the full surgery
 index.full.html
diff --git a/components/sections/comments/index.js b/components/sections/comments/index.js
new file mode 100644
index 00000000..c8b50248
--- /dev/null
+++ b/components/sections/comments/index.js
@@ -0,0 +1,43 @@
+var React = require("react");
+
+var style = {
+  width: 'calc(960px + 2em)',
+  marginTop: 0,
+  borderTop: '1px solid rgba(255, 0, 0, 0.5)',
+  paddingTop: '3em'
+};
+
+var sectionHTML = (
+  <section id="comments" style={style}>
+    <h2>Comments and questions</h2>
+
+    <p>If you enjoyed this book, or you simply found it useful for something you were trying to
+    get done, and you were wondering how to let me know you appreciated this book, you can
+    always <a className="link" href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=QPRDLNGDANJSW"
+    >buy me a coffee</a>, however much a coffee is where you live. This work has grown over the
+    years, from a small primer to a 70ish print-page-equivalent reader on the subject of Bézier
+    curves, and a lot of coffee went into the making of it. I don't regret a minute I spent
+on writing it, but I can always do with some more coffee to keep on writing!</p>
+
+    <div id="disqus_thread"/>
+  </section>
+);
+
+var CommentsAndQuestions = React.createClass({
+  getDefaultProps: function() {
+    return {
+      title: "Comments and Questions"
+    };
+  },
+  componentDidMount: function() {
+    if (typeof document !== "undefined") {
+      var disqusScript = document.createElement("script");
+      disqusScript.setAttribute("async", "async");
+      disqusScript.src = "lib/site/disqus.js";
+      document.head.appendChild(disqusScript);
+    }
+  },
+  render: function() { return sectionHTML; }
+});
+
+module.exports = CommentsAndQuestions;