Developer's-corner/Boundary-Conditions.md

@@ -93,7 +93,7 @@ They will be made available to the code through a [std::map](http://www.cplusplu
    
     std::map<std::string, std::string> const& params = gas.physic().boundaries.params;
     real voltage = boost::lexical_cast<real>(params.at("voltage"));
-    string type  = attrs["type"];
+    std::string type  = params.at("type");
     ...
  }
 ```