Developer's-corner/Boundary-Conditions.md

@@ -92,7 +92,7 @@ They will be made available to the code through a [std::map](http://www.cplusplu
  PetShopBC(Disk& gas, real dt) {
    
     std::map<std::string, std::string> const& params = gas.physic().boundaries.params;
-    real voltage = boost::lexical_cast<real>(attrs.at("voltage"));
+    real voltage = boost::lexical_cast<real>(params.at("voltage"));
     string type  = attrs["type"];
     ...
  }