diff --git a/modules/nixos/services/postgresql/default.nix b/modules/nixos/services/postgresql/default.nix
index 7559bb6..bbe46d4 100644
--- a/modules/nixos/services/postgresql/default.nix
+++ b/modules/nixos/services/postgresql/default.nix
@@ -58,6 +58,13 @@ in
               --old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
               --old-bindir "$OLDBIN" --new-bindir "$NEWBIN" \
               "$@"
+
+            cat << EOF
+              Run the following commands after setting:
+              services.postgresql.package = pkgs.postgresql_${lib.versions.major newPackage.version}
+                  sudo -u postgres vacuumdb --all --analyze-in-stages
+                  ${newData}/delete_old_cluster.sh
+            EOF
           '')
         ];
     })