diff --git a/.gitignore b/.gitignore
index 1dfb557..cd9fc47 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ assignments/0?/0?_?
 **CMakeCache.txt
 **CMakeFiles/
 **Makefile
+**.idx
 
 # latex compiling files
 **.toc