diff --git a/TeX.gitignore b/TeX.gitignore
index edd1f60..97f088f 100644
--- a/TeX.gitignore
+++ b/TeX.gitignore
@@ -137,6 +137,9 @@ acs-*.bib
 # listings
 *.lol
 
+# luatexja-ruby
+*.ltjruby
+
 # makeidx
 *.idx
 *.ilg