diff --git a/README.md b/README.md
index bc5eb1b..2b0a124 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,8 @@ sudo nixos-generate-config --dir yodaTab
 ```shell
 # Note how your shell prefix changes.
 nix-shell --packages appimage-run
+```
+```shell
 # Inside the shell, you can run an AppImage:
 appimage-run ~/Downloads/ubports-installer_0.10.0_linux_x86_64.AppImage
 ```
@@ -141,6 +143,25 @@ There are two (?) theses about Nix. One is https://edolstra.github.io/pubs/phd-t
 * https://mipmip.github.io/home-manager-option-search
     * Or `man home-configuration.nix`
 
+### Search wich package owns a file
+
+```shell
+# Note how your shell prefix changes.
+nix-shell --packages nix-index
+```
+```shell
+# Inside the shell:
+
+# Either build the index manually (requires >8GB RAM)
+nix-index
+# Or download weekly build:
+mkdir -p ~/.cache/nix-index/ && wget -q -N https://github.com/nix-community/nix-index-database/releases/latest/download/index-x86_64-linux -O ~/.cache/nix-index/files
+
+# Then search for a file
+nix-locate -w '/bash'
+```
+
+
 ### References
 
 Some references to websites that helped me create this repository: