diff --git a/.yardopts b/.yardopts
index 4499bf513..fb6f3348c 100644
--- a/.yardopts
+++ b/.yardopts
@@ -14,4 +14,7 @@ mrbgems/*/include/**/*.h
 AUTHORS
 LICENSE
 CONTRIBUTING.md
+SECURITY.md
+doc/*.md
 doc/guides/*.md
+doc/internal/*.md