1 files changed, 1 insertions, 0 deletions

diff --git a/readme.md b/readme.md
index e7c84be..c72a595 100644
--- a/readme.md
+++ b/readme.md
@@ -83,3 +83,4 @@ the error codes are:
 
 - 0: nothing.
 - 1: stack underflow
+- 2: word not found