1 files changed, 1 insertions, 0 deletions

diff --git a/.document b/.document
index 5494bcc7fe..ec2fa09326 100644
--- a/.document
+++ b/.document
@@ -24,6 +24,7 @@ pack.rb
 ractor.rb
 string.rb
 timev.rb
+thread_sync.rb
 trace_point.rb
 warning.rb