diff --git a/include/types/proto_http.h b/include/types/proto_http.h
index 8a12939..c9ec7e3 100644
--- a/include/types/proto_http.h
+++ b/include/types/proto_http.h
@@ -56,7 +56,9 @@
 #define TX_SVDENY	0x00000004	/* a server header matches a deny regex */
 #define TX_SVALLOW	0x00000008	/* a server header matches an allow regex */
 #define TX_CLTARPIT	0x00000010	/* the session is tarpitted (anti-dos) */
-/* unused:              0x00000020 */
+
+/* used only for keep-alive purposes, to indicate we're on a second transaction */
+#define TX_NOT_FIRST	0x00000020	/* the transaction is not the first one */
 
 /* transaction flags dedicated to cookies : bits values 0x40, 0x80 (0-3 shift 6) */
 #define TX_CK_NONE	0x00000000	/* this session had no cookie */
diff --git a/include/types/proxy.h b/include/types/proxy.h
index 92517ca..54190ee 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -100,12 +100,11 @@
 #define PR_O_TPXY_CLI	0x06000000	/* bind to the client's IP+port when connect()ing */
 #define PR_O_TPXY_MASK	0x06000000	/* bind to a non-local address when connect()ing */
 
-/* unused : tcpsplice   0x08000000 */
+#define PR_O_SERVER_CLO 0x08000000	/* option http-server-close */
 #define PR_O_CONTSTATS	0x10000000	/* continous counters */
 #define PR_O_HTTP_PROXY 0x20000000	/* Enable session to use HTTP proxy operations */
 #define PR_O_DISABLE404 0x40000000      /* Disable a server on a 404 response to a health-check */
 #define PR_O_ORGTO      0x80000000      /* insert x-original-to with destination address */
-/* unused: 0x80000000 - now used by PR_O_ORGTO */
 
 /* bits for proxy->options2 */
 #define PR_O2_SPLIC_REQ	0x00000001      /* transfer requests using linux kernel's splice() */