1 files changed, 1 insertions, 0 deletions
diff --git a/setup.py b/setup.py
index 6dad7ac..d45f178 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,7 @@ setup(
         'python-magic',
         'rdflib', # only for tests
         'requests', # only for tests
+        'preview_generator', # also depends on some system packages
         ),
     python_requires=">=3.7",
     extra_require=(