Adding more info about the core.

1 files changed, 6 insertions, 4 deletions

diff --git a/README.md b/README.md
index d27d280..10150df 100644
--- a/README.md
+++ b/README.md
@@ -25,12 +25,14 @@ The actual core consists of the following files:
 - sha256_w_mem.v - W message block memort and expansion logic.
 - sha256_k_constants.v - K constants ROM memory.
 
-The top level entity is called sha256_core.
+The top level entity is called sha256_core. This entity has wide
+interfaces (512 bit block input, 256 bit digest). In order to make it
+usable you probably want to wrap the core with a bus interface.
 
-Unless you want to provide your own interface you also need to select
-one top level wrapper. There are two wrappers provided:
+Unless you want to provide your own interface you therefore also need to
+select one top level wrapper. There are two wrappers provided:
 - sha256.v - A wrapper with a 32-bit memory like interface.
-- wb_sha256.v - A wrapper that implement a [Wishbone](http://opencores.org/opencores,wishbone) interface.
+- wb_sha256.v - A wrapper that implements a [Wishbone](http://opencores.org/opencores,wishbone) interface.
 
 ***Do not include both wrappers in the same project.***