Clarify confusion regarding code example as seen here: http://stackoverflow.com/questions/4273056/jsoncpp-not-reading-files-correctly (i.e. I had the same problem).

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@@ -28,6 +28,16 @@ Features
 
 Code example
 ------------
+You must open the file in an `std::ifstream` before you can use it:
+
+```cpp
+#include <fstream>
+
+std::ifstream config_doc("config_doc.json", std::ifstream::binary);
+```
+
+Once that is done you can then use jsoncpp to parse the data:
+
 ```cpp
 Json::Value root;   // will contains the root value after parsing
 Json::Reader reader;