diff --git a/src/mod_invites.erl b/src/mod_invites.erl
index 86f67e676..f2b7562d5 100644
--- a/src/mod_invites.erl
+++ b/src/mod_invites.erl
@@ -250,6 +250,8 @@ mod_doc() ->
              "    allow_modules:",
              "      - mod_invites"]}]}.
 
+-spec mod_options(binary()) ->
+          [{landing_page, none | auto | binary()} | {atom(), any()}].
 mod_options(Host) ->
     [{access_create_account, none},
      {db_type, ejabberd_config:default_db(Host, ?MODULE)},
diff --git a/src/mod_invites_opt.erl b/src/mod_invites_opt.erl
index b0d038478..18f8102c7 100644
--- a/src/mod_invites_opt.erl
+++ b/src/mod_invites_opt.erl
@@ -23,7 +23,7 @@ db_type(Opts) when is_map(Opts) ->
 db_type(Host) ->
     gen_mod:get_module_opt(Host, mod_invites, db_type).
 
--spec landing_page(gen_mod:opts() | global | binary()) -> any().
+-spec landing_page(gen_mod:opts() | global | binary()) -> 'none' | 'auto' | binary().
 landing_page(Opts) when is_map(Opts) ->
     gen_mod:get_opt(landing_page, Opts);
 landing_page(Host) ->