diff --git a/setup.py b/setup.py
index 37e9b1f..aabd53d 100755
--- a/setup.py
+++ b/setup.py
@@ -29,6 +29,7 @@
     install_requires=[
         'Pillow',
         'lxml',
+        'python-bidi',
         'reportlab',
     ],
     scripts=[c for c in glob.glob("hocr-*")]