diff --git a/docs/setup.rst b/docs/setup.rst
index ddd246b16..e88524b08 100644
--- a/docs/setup.rst
+++ b/docs/setup.rst
@@ -229,6 +229,7 @@ writing. Windows is not and will never be supported.
     *   ``python3-pip``, optionally ``pipenv`` for package installation
     *   ``python3-dev``
 
+    *   ``gettext`` for compiling interface translations
     *   ``fonts-liberation`` for generating thumbnails for plain text files
     *   ``imagemagick`` >= 6 for PDF conversion
     *   ``optipng`` for optimizing thumbnails