diff --git a/erlang/apps/lib/src/escript_runtime.erl b/erlang/apps/lib/src/escript_runtime.erl
index b7ab8d6..0dd87d6 100644
--- a/erlang/apps/lib/src/escript_runtime.erl
+++ b/erlang/apps/lib/src/escript_runtime.erl
@@ -27,6 +27,7 @@
         , start/2
         ]).
 
+%% TODO: remove when we're on OTP >= 24
 %% escript logs unhandled exceptions to standard output, but we want them to
 %% end up on standard error
 -spec start(fun(([string()]) -> any()), [string()]) -> any().