diff --git a/priv/templates/sup.erl b/priv/templates/sup.erl
index a2e72098..0db7155b 100644
--- a/priv/templates/sup.erl
+++ b/priv/templates/sup.erl
@@ -26,6 +26,9 @@ start_link() ->
 %% Supervisor callbacks
 %%====================================================================
 
+%% Child :: #{id => Id, start => {M, F, A}}
+%% Optional keys are restart, shutdown, type, modules.
+%% Before OTP 18 tuples must be used to specify a child. e.g.
 %% Child :: {Id,StartFunc,Restart,Shutdown,Type,Modules}
 init([]) ->
     {ok, { {one_for_all, 0, 1}, []} }.