diff --git a/ansi/lcd-terminal.rkt b/ansi/lcd-terminal.rkt
index df8a3ab..ef573d9 100644
--- a/ansi/lcd-terminal.rkt
+++ b/ansi/lcd-terminal.rkt
@@ -4,6 +4,7 @@
 (provide (struct-out key)
          (struct-out unknown-escape-sequence)
          (struct-out position-report)
+         add-modifier
          lex-lcd-input)
 
 (require racket/set)