cffi-posix/cffi-errno

diff --git a/package.lisp b/package.lisp
index 7338f77..e310a1b 100644
--- a/package.lisp
+++ b/package.lisp
@@ -2,6 +2,7 @@
 (in-package :common-lisp)
 
 (defpackage :cffi-errno
+  (:nicknames :errno)
   (:use :common-lisp :cffi)
   (:export
    #:errno