diff --git a/pages/02.linux/01.file-operations/default.en.md b/pages/02.linux/01.file-operations/default.en.md
index 0340ad7..f33ecbc 100644
--- a/pages/02.linux/01.file-operations/default.en.md
+++ b/pages/02.linux/01.file-operations/default.en.md
@@ -2,6 +2,7 @@
 title: 'File Operations'
 ---
 
+[toc]
 ## Workings of file permissions
 
 ### Change permissions