diff --git a/src/Environment/environment_ctrl.cxx b/src/Environment/environment_ctrl.cxx
index 814f1f4a3..a947c48a9 100644
--- a/src/Environment/environment_ctrl.cxx
+++ b/src/Environment/environment_ctrl.cxx
@@ -573,7 +573,8 @@ FGMetarEnvironmentCtrl::fetch_data( const string &icao )
 
             if (++_stale_count > 10) {
                 _error_count = 1000;
-                throw sg_io_exception("More than 10 stale METAR messages in a row.");
+                throw sg_io_exception("More than 10 stale METAR messages in a row."
+                        " Check your system time!");
             }
         } else
             _stale_count = 0;