Feature, classes, use relative reference

Change-Id: I1942580e78d3c9e83fdad4927532186441fe3298
diff --git a/README.rst b/README.rst
index b865e4f..7461ea7 100644
--- a/README.rst
+++ b/README.rst
@@ -23,7 +23,7 @@
 =============
 
 Documentation covering the original version is in the doc directory.
-See the README-extensions.rst file for documentation on the extentions.
+See the `README-extensions.rst` file for documentation on the extentions.