diff --git a/docs/conf.py b/docs/conf.py
index e50db8d..8d93ead 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -51,7 +51,7 @@ templates_path = ['_templates']
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path.
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', '_env']
 
 
 # -- Options for HTML output -------------------------------------------------