diff --git a/wrapper.go b/wrapper.go
index fe1298c..453fc70 100644
--- a/wrapper.go
+++ b/wrapper.go
@@ -189,6 +189,7 @@ func (s *State) IsString(index int) bool    { return s.GetType(index) == TypeStr
 func (s *State) IsNumber(index int) bool    { return s.GetType(index) == TypeNumber }
 func (s *State) IsFunction(index int) bool  { return s.GetType(index) == TypeFunction }
 func (s *State) IsTable(index int) bool     { return s.GetType(index) == TypeTable }
+func (s *State) IsNil(index int) bool       { return s.GetType(index) == TypeNil }
 func (s *State) ToBoolean(index int) bool   { return C.lua_toboolean(s.L, C.int(index)) != 0 }
 func (s *State) ToNumber(index int) float64 { return float64(C.lua_tonumber(s.L, C.int(index))) }
 func (s *State) ToString(index int) string {
@@ -327,3 +328,16 @@ func (s *State) AddPackagePath(path string) error {
 	}
 	return nil
 }
+
+func (s *State) Call(nargs, nresults int) error {
+	status := C.lua_pcall(s.L, C.int(nargs), C.int(nresults), 0)
+	if status != 0 {
+		err := &LuaError{
+			Code:    int(status),
+			Message: s.ToString(-1),
+		}
+		s.Pop(1)
+		return err
+	}
+	return nil
+}