diff --git a/.yardopts b/.yardopts
index f20a6682..8e1a5530 100644
--- a/.yardopts
+++ b/.yardopts
@@ -3,7 +3,7 @@
 --hide-void-return
 _tools/ruby_h_to_go/*.rb
 _tools/ruby_h_to_go/lib/**/*.rb
-gem/**/*.rb
+_gem/**/*.rb
 -
 CHANGELOG.md
 LICENSE