diff --git a/fill3/fill3/terminal.py b/fill3/fill3/terminal.py
index 4552ecb..934c725 100644
--- a/fill3/fill3/terminal.py
+++ b/fill3/fill3/terminal.py
@@ -23,6 +23,7 @@ CTRL_SPACE = "\x00"
 CTRL_UNDERSCORE = "\x1f"
 ENTER = "\n"
 TAB = "\t"
+INSERT = ESC + "[2~"
 DELETE = ESC + "[3~"
 BACKSPACE = "\x7f"
 ALT_BACKSPACE = ESC + BACKSPACE