diff --git a/build.py b/build.py
index 0189208..016a46d 100644
--- a/build.py
+++ b/build.py
@@ -135,6 +135,8 @@ title: {repr(input['title'])}
 def index_dir(dir):
     import frontmatter
     dir = Path(dir)
+    if dir.name.startswith('.'):
+        return
     if (dir / '.order').exists():
         order = (dir / '.order').read_text().split('\n')
         f = [p for p in dir.glob('*') if not p.name.startswith('.')]