Update dsl.go
typo fix
@@ -258,7 +258,7 @@ func HelperFunctions() map[string]govaluate.ExpressionFunction {
return functions
}
-// AddHelperFunction allows creation of additiona helper functions to be supported with templates
+// AddHelperFunction allows creation of additional helper functions to be supported with templates
func AddHelperFunction(key string, value func(args ...interface{}) (interface{}, error)) error {
if _, ok := functions[key]; !ok {
functions[key] = value
