diff --git a/.gitignore b/.gitignore
index 8dada724d7..ef35d1b86b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,9 +48,10 @@ cmake_install.cmake
 install_manifest.txt
 CTestTestfile.cmake
 
-# Windows
+# Operating system
 Thumbs.db
 ehthumbs.db
+.DS_Store
 
 # Python
 __pycache__/