diff --git a/include/types/server.h b/include/types/server.h
index 91f8a9d..6d0566b 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -151,6 +151,7 @@
 #define SRV_PP_V2_SSL_KEY_ALG   0x0010   /* proxy protocol version 2 with cert key algorithm */
 #define SRV_PP_V2_SSL_SIG_ALG   0x0020   /* proxy protocol version 2 with cert signature algorithm */
 #define SRV_PP_V2_SSL_CIPHER    0x0040   /* proxy protocol version 2 with cipher used */
+#define SRV_PP_V2_AUTHORITY     0x0080   /* proxy protocol version 2 with authority */
 
 /* function which act on servers need to return various errors */
 #define SRV_STATUS_OK       0   /* everything is OK. */