Add note about module support in README.

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 19328a8..55855fe 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@ This crate provides convenience methods for encoding and decoding numbers in
 either big-endian or little-endian order. This is meant to replace the old
 methods defined on the standard library `Reader` and `Writer` traits.
 
+**This crate currently supports both the `std::io` and `std::old_io` modules.**
+
 [![Build status](https://api.travis-ci.org/BurntSushi/byteorder.png)](https://travis-ci.org/BurntSushi/byteorder)
 
 Licensed under the [UNLICENSE](http://unlicense.org).