diff --git a/lib.nix b/lib.nix
index 75d89c9..bee8fb1 100644
--- a/lib.nix
+++ b/lib.nix
@@ -147,6 +147,7 @@ in
           PGDATA=$(realpath ${data_dir})
           PGHOST=$(realpath ${runtimeDir})
           PGPORT=${builtins.toString port}
+          echo "Starting postgres with PGDATA=''${PGDATA} PGHOST=''${PGHOST} PGPORT=''${PGPORT}"
           export PGDATA PGHOST PGPORT
           ${setupScript}/bin/setup-postgres
           ${package}/bin/postgres