diff --git a/include/boost/process/async.hpp b/include/boost/process/async.hpp
index 9698aab9..b6ed5a76 100644
--- a/include/boost/process/async.hpp
+++ b/include/boost/process/async.hpp
@@ -117,8 +117,8 @@ chlid c2("ls", on_exit=exit_code);
 \endcode
 
 \note The handler is not invoked when the launch fails.
-\warning When used \ref ignore_error it might gte invoked on error.
-
+\warning When used \ref ignore_error it might get invoked on error.
+\warning All `on_exit` use one signal(SIGCHLD) on poisx, which is only guaranteed to work when all use the same `io_service`.
  */
 constexpr static ::boost::process::detail::on_exit_ on_exit{};
 #endif