diff --git a/man/3proxy.cfg.3 b/man/3proxy.cfg.3
index adeab05..6bbb7a4 100644
--- a/man/3proxy.cfg.3
+++ b/man/3proxy.cfg.3
@@ -155,8 +155,8 @@ connect to given remote HOST:port instead of listening local connection on -p or
 .B -ocOPTIONS, -osOPTIONS, -olOPTIONS
 options for client (oc), server (os) or listening (ol) socket. Options like TCP_CORK, TCP_NODELAY, TCP_DEFER_ACCEPT, TCP_QUICKACK, TCP_TIMESTAMPS, USE_TCP_FASTOPEN, SO_REUSEADDR, SO_REUSEPORT, SO_PORT_SCALABILITY, SO_REUSE_UNICASTPORT, SO_KEEPALIVE, SO_DONTROUTE may be supported depending on OS.
 .br
-.B -DiINTERFACE, -DoINTERFACE
-bind incoming connection / outgoing connection to given INTERFACE (e.g. eth0) if SO_BINDTODEVICE supported by system
+.B -DiINTERFACE, -DeINTERFACE
+bind internal interface / external inteface to given INTERFACE (e.g. eth0) if SO_BINDTODEVICE supported by system
 .br
  Also, all options mentioned for 
 .BR proxy (8)
diff --git a/src/proxymain.c b/src/proxymain.c
index f1d74be..7d21e7b 100644
--- a/src/proxymain.c
+++ b/src/proxymain.c
@@ -177,8 +177,8 @@ int MODULEMAINFUNC (int argc, char** argv){
 	" -u2 always ask for username\n"
 #endif
 #ifdef SO_BINDTODEVICE
-	" -Di(DEVICENAME) bind to incoming device, e.g. eth1\n"
-	" -Do(DEVICENAME) bind to outgoing device, e.g. eth1\n"
+	" -Di(DEVICENAME) bind internal interface to device, e.g. eth1\n"
+	" -De(DEVICENAME) bind external interface to device, e.g. eth1\n"
 #endif
 #ifdef WITHSLICE
 	" -s Use slice() - faster proxing, but no filtering for data\n"
@@ -309,7 +309,7 @@ int MODULEMAINFUNC (int argc, char** argv){
 #ifdef SO_BINDTODEVICE
 		 case 'D':
 			if(argv[i][2] == 'i') srv.ibindtodevice = mystrdup(argv[i] + 3);
-			else if(argv[i][2] == 'o') srv.obindtodevice = mystrdup(argv[i] + 3);
+			else srv.obindtodevice = mystrdup(argv[i] + 3);
 			break;
 #endif
 		 case 'l':