diff --git a/nyx.h b/nyx.h
index 237e53a..3d81a31 100644
--- a/nyx.h
+++ b/nyx.h
@@ -295,7 +295,7 @@ static void habort(char* msg){
 #define NYX_HOST_MAGIC  0x4878794e
 #define NYX_AGENT_MAGIC 0x4178794e
 
-#define NYX_HOST_VERSION 1 
+#define NYX_HOST_VERSION 2 
 #define NYX_AGENT_VERSION 1
 
 typedef struct host_config_s{
@@ -303,7 +303,8 @@ typedef struct host_config_s{
   uint32_t host_version;
   uint32_t bitmap_size;
   uint32_t ijon_bitmap_size;
-uint32_t payload_buffer_size;
+  uint32_t payload_buffer_size;
+  uint32_t worker_id;
   /* more to come */
 } __attribute__((packed)) host_config_t;