cl-stream/unistd-stream

diff --git a/README.md b/README.md
index f81f679..2eb7597 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,10 @@ fd-stream streams are `(unsigned-byte 8)` cl-stream streams
 using `unistd:read`, `unistd:write` and `unistd:close` to
 operate on Unix file descriptors.
 
-See https://github.com/cl-stream/cl-stream .
+Depends on :
+- https://github.com/cffi-posix/cffi-fcntl
+- https://github.com/cffi-posix/cffi-unistd
+- https://github.com/cl-stream/cl-stream
 
 ## Class: fd-stream
 Base class for file descriptor streams.