diff --git a/.gitignore b/.gitignore
index 6be9976..ea2ff50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,5 @@
 #==============================================================================#
 # Clang extra user tools, which is tracked independently (clang-tools-extra).
 tools/extra
+# Sphinx build products
+docs/_build