diff --git a/Linux/nix-tips-and-tricks.md b/Linux/nix-tips-and-tricks.md
index 73270c2..179699e 100644
--- a/Linux/nix-tips-and-tricks.md
+++ b/Linux/nix-tips-and-tricks.md
@@ -1,3 +1,5 @@
+[[_TOC_]]
+
 # Nix Package Manager
 
 ## Add packages