diff --git a/src/java/timezones.properties b/src/java/timezones.properties
index cefddf59..20da9fa1 100644
--- a/src/java/timezones.properties
+++ b/src/java/timezones.properties
@@ -75,5 +75,5 @@
 GMT\ +0100\ (Standard)\ /\ GMT\ +0200\ (Daylight)=Europe/Paris
 GMT\ +1000\ (Standard)\ /\ GMT\ +1100\ (Daylight)=Australia/Melbourne
 GMT\ -0500\ (Standard)\ /\ GMT\ -0400\ (Daylight)=America/New_York
+GMT\ -0600\ (Standard)\ /\ GMT\ -0500\ (Daylight)=America/Chicago
 GMT\ -0700\ (Standard)\ /\ GMT\ -0600\ (Daylight)=America/Denver
-