Developer's-corner/Configuration-Checks.md

@@ -9,6 +9,8 @@ When loading the configuration, all registered checks will be called upon the pr
 
 ## example
 
+Let say you want to make sure that user does not specify both co-rotating referential and the rotation speed:
+
 ```
 bool
 CheckReferentialRotation(pt::ptree const& pt, std::ostream& log) {