Update README.md

README.md

 Implementation of `scope_guard` and `unique_resource` as proposed in [**N3949**][1].
 
 
+## Compatibility
+
+This implemenation conforms to [N3949][1], except:
+
+1. **Namespace:** Another namespace is used instead of `std`.
+1. **Filenames:** The filenames contain a `.h` extension.
+
+These deviations are necessary through standard requirements.
+
+
 ## Documentation
 
 - [*N3949 - Scoped Resource - Generic RAII Wrapper for the Standard Library*][1] (P. Sommerlad, A. L. Sandoval)
 
+
+
 ## License
 
 **GNU General Public License (GPL)**