diff --git a/mqtt-client/src/main/java/org/fusesource/mqtt/codec/CONNACK.java b/mqtt-client/src/main/java/org/fusesource/mqtt/codec/CONNACK.java
index db9aa3c..76947e0 100644
--- a/mqtt-client/src/main/java/org/fusesource/mqtt/codec/CONNACK.java
+++ b/mqtt-client/src/main/java/org/fusesource/mqtt/codec/CONNACK.java
@@ -40,7 +40,13 @@ public static enum Code {
         CONNECTION_REFUSED_IDENTIFIER_REJECTED,
         CONNECTION_REFUSED_SERVER_UNAVAILABLE,
         CONNECTION_REFUSED_BAD_USERNAME_OR_PASSWORD,
-        CONNECTION_REFUSED_NOT_AUTHORIZED;
+        CONNECTION_REFUSED_NOT_AUTHORIZED,
+        CONNECTION_HC_OK,
+        CONNECTION_REFUSED_BAD_KEEP_ALIVE,
+        CONNECTION_REFUSED_SERVER_SHEDDING_LOAD,
+        CONNECTION_REFUSED_PROTOCOL_VIOLATION,
+        CONNECTION_REFUSED_BAD_CONNECT_HASH,
+        CONNECTION_REFUSED_AUTH_NOT_AVAILABLE;
     }
 
     private Code code = Code.CONNECTION_ACCEPTED;