diff --git a/.gitignore b/.gitignore
index 295a18b539..6b9257b5c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,6 @@ __pycache__/
 /docs/build/
 /htmlcov
 /pip-wheel-metadata/
+
+# docs
+book/