add warning that the "-e" option should be used as the last option

src/main.cpp

@@ -146,7 +146,9 @@ void fillCommandLineOptions(KCmdLineOptions& options)
                       " (for use with -p)"));
     options.add("p <property=value>",
                 ki18n("Change the value of a profile property."));
-    options.add("!e <cmd>", ki18n("Command to execute"));
+    options.add("!e <cmd>",
+                ki18n("Command to execute. This option will catch all follwing"
+                      " arguments, so use it as the last option."));
     options.add("+[args]", ki18n("Arguments passed to command"));
     options.add("", ki18n("Use --nofork to run in the foreground (helpful"
                           " with the -e option)."));