diff --git a/doc/sphinx/_build/.gitignore b/doc/sphinx/_build/.gitignore
new file mode 100644
index 0000000..76bedae
--- /dev/null
+++ b/doc/sphinx/_build/.gitignore
@@ -0,0 +1,5 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore
+