diff --git a/flake.nix b/flake.nix
index 82e007d..ef1ea2f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -118,6 +118,7 @@
     in syspkgs.mkShell rec {
       pname = "lagarto-ox-shell";
       COMMIT = if self ? rev then self.rev else "dirty";
+      REPO = self;
       TOPLEVEL = build.toplevel;
       OPENSBI = syspkgs.opensbi;
       KERNEL = build.kernel;
@@ -132,6 +133,7 @@
       shellHook = ''
         echo "Here are the current system pieces:"
         echo " COMMIT    = $COMMIT"
+        echo " REPO      = $REPO"
         echo " TOPLEVEL  = $TOPLEVEL"
         echo " KERNEL    = $KERNEL"
         echo " OPENSBI   = $OPENSBI"