diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 06b9c3fbf4c..16e3235eb2c 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -119,7 +119,7 @@ in
       extraPlugins = mkOption {
         type = types.listOf types.path;
         default = [];
-        example = literalExample "pkgs.postgis";
+        example = literalExample "[ (pkgs.postgis.override { postgresql = pkgs.postgresql94; }).v_2_1_4 ]";
         description = ''
           When this list contains elements a new store path is created.
           PostgreSQL and the elments are symlinked into it. Then pg_config,