diff --git a/README.md b/README.md
index e6a40dc..8d8985b 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,7 @@
 # get-nix-sources
 
+'''hash
+nix-instantiate "<nixpkgs>" -A hello | xargs nix-store --query -R | grep '\.drv' | xargs nix derivation --extra-experimental-features nix-command show | jq 'to_entries[] | select( (.value.outputs | type == "object") and (.value.outputs | to_entries | all(.value | has("hash"))) and (.value.outputs | to_entries | length > 0)) | .key'
+
+'''
+