diff --git a/.gitignore b/.gitignore
index 6bc7b3394e4..b172c446553 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,9 @@ Desktop.ini
 # local patches
 /*.patch
 /*.diff
+
+# in-source doc-gen
+/doc/doxygen/html/
+/doc/python_api/sphinx-in-tmp/
+/doc/python_api/sphinx-in/
+/doc/python_api/sphinx-out/