diff --git a/docs/conf.py b/docs/conf.py
index 34dd5bcb7..9e0033ef1 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -98,6 +98,9 @@ exclude_trees = ['.build']
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 
+# List of Sphinx warnings that will not be raised
+suppress_warnings = ['epub.unknown_project_files']
+
 
 # Options for HTML output
 # -----------------------