diff --git a/iot.adoc b/iot.adoc
index c5ef823..4df6a3f 100644
--- a/iot.adoc
+++ b/iot.adoc
@@ -149,7 +149,6 @@ void read_lilypad () {
 ----
 import smbus                  <1>
 import time                   <1>
-import signal                 <1>
 import re                     <1>
 from datetime import datetime <1>