Highlight that the unit checking module is still experimental

Compiler/Util/Flags.mo

@@ -790,7 +790,7 @@ constant ConfigFlag PRE_OPT_MODULES = CONFIG_FLAG(12, "preOptModules",
     ("simplifyIfEquations", Util.gettext("Tries to simplify if equations by use of information from evaluated parameters.")),
     ("sortEqnsVars", Util.notrans("Heuristic sorting for equations and variables. This module requires +d=sortEqnsAndVars.")),
     ("stateMachineElab", Util.gettext("Does the elaboration of state machines.")),
-    ("unitChecking", Util.gettext("advanced unit checking: 1. calculation of unspecified unit information for variables; 2. unit consistency check for equations")),
+    ("unitChecking", Util.gettext("Does advanced unit checking which consists of two parts: 1. calculation of unspecified unit information for variables; 2. consistency check for all equations based on unit information. Please note: This module is still experimental.")),
     ("wrapFunctionCalls", Util.gettext("This module introduces variables for each function call and substitutes all these calls with the newly introduced variables."))
     })),
   Util.gettext("Sets the pre optimization modules to use in the back end. See --help=optmodules for more info."));