1 files changed, 1 insertions, 0 deletions
diff --git a/src/package.lisp b/src/package.lisp
index c2c3fb4..7b7dbfe 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -4,5 +4,6 @@
   (:use #:cl #:iter)
   (:export #:l-system
   	   #:->
+           #:unset-rule
 	   #:parametric-grammar
 	   #:context-sensitive-grammar))