diff --git a/clang-tools-extra/.gitignore b/clang-tools-extra/.gitignore
index ab821231891c..ac573c4aa688 100644
--- a/clang-tools-extra/.gitignore
+++ b/clang-tools-extra/.gitignore
@@ -29,3 +29,4 @@ cscope.out
 #==============================================================================#
 # Directories to ignore (do not add trailing '/'s, they skip symlinks).
 #==============================================================================#
+docs/_build