diff --git a/demo/arg_parser_demo.cc b/demo/arg_parser_demo.cc
--- a/demo/arg_parser_demo.cc
+++ b/demo/arg_parser_demo.cc
@@ -37,6 +37,7 @@
   bool g1,g2,g3;
   ap.refOption("n", "An integer input.", i, true)
     .refOption("val", "A double input.", d)
+    .doubleOption("val2", "A double input.", d)
     .synonym("vals","val")
     .refOption("name", "A string input.", s)
     .refOption("f", "A switch.", b)
@@ -45,7 +46,7 @@
     .refOption("grb","Choice B",g2)
     .refOption("grc","Choice C",g3)
     .optionGroup("gr","gra")
-    .optionGroup("gr","grb")
+    .optionGroup("gr","grbkk")
     .optionGroup("gr","grc")
     .mandatoryGroup("gr")
     .onlyOneGroup("gr")