diff --git a/build.py b/build.py
index 13cd7a8..79bafc0 100755
--- a/build.py
+++ b/build.py
@@ -40,7 +40,7 @@ def main():
             count += 1
 
             # Future-proofing
-            if not filename.endswith(".html") and not filename.endswith(".md"):
+            if filename.rsplit(".")[-1] not in ("html", "md", "txt"):
                 raise Exception("Support for this filetype is not yet supported:", filename)
 
             path = src / dirpath / filename
@@ -58,30 +58,34 @@ def main():
                 content = md.convert(content)
                 meta = md.Meta
 
-            # Inject content into the template
-            page_content = bs4.BeautifulSoup(content, features="html.parser")
-            page = copy.copy(template)
-            article = page.new_tag("article")
-            article.append(page_content)
-            page.article.replace_with(article)
+            if dest.name.endswith("html"):
+                # Inject content into the template
+                page_content = bs4.BeautifulSoup(content, features="html.parser")
+                page = copy.copy(template)
+                article = page.new_tag("article")
+                article.append(page_content)
+                page.article.replace_with(article)
 
-            # Inject path into the nav
-            for i in range(len(dirpath.parts)):
-                a = page.new_tag("a")
-                a["href"] = "/" + "/".join(dirpath.parts[:i+1]) + "/"
-                a.string = dirpath.parts[i]
-                page.nav.append(a)
-                page.nav.append(page.new_string("/"))
+                # Inject path into the nav
+                for i in range(len(dirpath.parts)):
+                    a = page.new_tag("a")
+                    a["href"] = "/" + "/".join(dirpath.parts[:i+1]) + "/"
+                    a.string = dirpath.parts[i]
+                    page.nav.append(a)
+                    page.nav.append(page.new_string("/"))
 
-            # Apply metadata to the template
-            if meta_title := meta.get("title"):
-                title = "".join(meta_title)
-                page.title.string = title
-                page.header.h1.string = title
+                # Apply metadata to the template
+                if meta_title := meta.get("title"):
+                    title = "".join(meta_title)
+                    page.title.string = title
+                    page.header.h1.string = title
+
+                # The fully templated page is the new content
+                content = str(page)
 
             # Write the destination file
             print("Writing   ", dest)
-            dest.write_text(str(page))
+            dest.write_text(content)
 
     print("Processed", count, "files")
 
diff --git a/src/robots.txt b/src/robots.txt
new file mode 100644
index 0000000..1f53798
--- /dev/null
+++ b/src/robots.txt
@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /