diff --git a/.gitignore b/.gitignore
index 55504ac..4f174ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,11 @@
 *.toc
 *.blg
 *.out
+
+# index
+*.idx
+*.ilg
+*.ind
+
 # generated
 verstr.tex