diff --git a/docs/source/conf.py b/docs/source/conf.py
index 183200f85..35f69670e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -177,3 +177,5 @@ texinfo_documents = [
 # -- Options for to do extension ----------------------------------------------
 
 # todo_include_todos = True
+
+suppress_warnings = ['epub.unknown_project_files', 'html.unknown_project_files']