diff --git a/NixOS.md b/NixOS.md
index 2719e64..615767c 100644
--- a/NixOS.md
+++ b/NixOS.md
@@ -436,6 +436,15 @@ runtime dependencies of firefox-121.0.1:
 
 ## Nix profiles
 
+### Switch to previous system profile
+
+https://tldr.inbrowser.app/pages/linux/nixos-rebuild
+
+```shell
+sudo nixos-rebuild switch --rollback boot
+sudo reboot
+```
+
 ### List system profiles
 
 Not sure why 432 is marked as current. It is the default generation that gets activated on next boot. The currently active generation is, however, 429.