diff --git a/man/shadowsocks-libev.8 b/man/shadowsocks-libev.8
index 3f341aaa..6945b480 100644
--- a/man/shadowsocks-libev.8
+++ b/man/shadowsocks-libev.8
@@ -88,6 +88,11 @@ Set the socket timeout in seconds. The default value is 10.
 .B \-c \fIconfig_file\fP
 Use a configuration file.
 .TP
+.B \-n \fInofile\fP
+Specify max number of open files.
+
+Only available on Linux.
+.TP
 .B \-i \fIinterface\fP
 Specify network interface to bind.
 
diff --git a/man/ss-local.1 b/man/ss-local.1
index 52d9d96f..04ec5209 100644
--- a/man/ss-local.1
+++ b/man/ss-local.1
@@ -35,7 +35,7 @@ ss-local \- shadowsocks client as socks5 proxy, libev port
     [\fB\-s\fR \fIserver_host\fR] [\fB\-p\fR \fIserver_port\fR]    [\fB\-l\fR \fIlocal_port\fR]
     [\fB\-k\fR \fIpassword\fR]    [\fB\-m\fR \fIencrypt_method\fR] [\fB\-f\fR \fIpid_file\fR]   [\fB\-t\fR \fItimeout\fR]
     [\fB\-c\fR \fIconfig_file\fR] [\fB\-b\fR \fIinterface\fR]      [\fB\-a\fR \fIuser_name\fR]
-    [\fB\-\-fast\-open\fR]    [\fB\-\-acl\fR \fIacl_config\fR]
+    [\fB\-n\fR \fInofile\fR]      [\fB\-\-fast\-open\fR]    [\fB\-\-acl\fR \fIacl_config\fR]
 
 .SH DESCRIPTION
 \*(Me is a lightweight and secure socks5 proxy. It is a port of the original
@@ -79,6 +79,11 @@ Set the socket timeout in seconds. The default value is 10.
 .B \-c \fIconfig_file\fP
 Use a configuration file.
 .TP
+.B \-n \fInofile\fP
+Specify max number of open files.
+
+Only avaliable on Linux.
+.TP
 .B \-i \fIinterface\fP
 Specify network interface to bind.
 .TP
diff --git a/man/ss-redir.1 b/man/ss-redir.1
index f9b3065e..e3f5045f 100644
--- a/man/ss-redir.1
+++ b/man/ss-redir.1
@@ -35,7 +35,7 @@ ss-redir \- shadowsocks client as transparent proxy, libev port
     [\fB\-s\fR \fIserver_host\fR] [\fB\-p\fR \fIserver_port\fR]    [\fB\-l\fR \fIlocal_port\fR]
     [\fB\-k\fR \fIpassword\fR]    [\fB\-m\fR \fIencrypt_method\fR] [\fB\-f\fR \fIpid_file\fR]
     [\fB\-t\fR \fItimeout\fR]     [\fB\-c\fR \fIconfig_file\fR]    [\fB\-b\fR \fIlocal_address\fR]
-    [\fB\-a\fR \fIuser_name\fR]
+    [\fB\-a\fR \fIuser_name\fR]   [\fB\-n\fR \fInofile\fR]
 
 .SH DESCRIPTION
 \*(Me is a lightweight and secure socks5 proxy. It is a port of the original
@@ -81,6 +81,11 @@ Set the socket timeout in seconds. The default value is 10.
 .B \-c \fIconfig_file\fP
 Use a configuration file.
 .TP
+.B \-n \fInofile\fP
+Specify max number of open files.
+
+Only avaliable on Linux.
+.TP
 .B \-b \fIlocal_address\fP
 Specify local address to bind.
 .TP
diff --git a/man/ss-server.1 b/man/ss-server.1
index f386d5ff..b6dd09a8 100644
--- a/man/ss-server.1
+++ b/man/ss-server.1
@@ -35,7 +35,7 @@ ss-server \- shadowsocks server, libev port
     [\fB\-s\fR \fIserver_host\fR] [\fB\-p\fR \fIserver_port\fR]    [\fB\-l\fR \fIlocal_port\fR]
     [\fB\-k\fR \fIpassword\fR]    [\fB\-m\fR \fIencrypt_method\fR] [\fB\-f\fR \fIpid_file\fR]
     [\fB\-t\fR \fItimeout\fR]     [\fB\-c\fR \fIconfig_file\fR]    [\fB\-i\fR \fIinterface\fR]
-    [\fB\-a\fR \fIuser_name\fR]   [\fB\-d\fR \fIaddr\fR]
+    [\fB\-a\fR \fIuser_name\fR]   [\fB\-d\fR \fIaddr\fR]           [\fB\-n\fR \fInofile\fR]
     [\fB\-\-fast\-open\fR]    [\fB\-\-acl\fR \fIacl_config\fR]
     [\fB\-\-manager\-address\fR \fIpath_to_unix_domain\fR]
 
@@ -81,6 +81,11 @@ Set the socket timeout in seconds. The default value is 10.
 .B \-c \fIconfig_file\fP
 Use a configuration file.
 .TP
+.B \-n \fInofile\fP
+Specify max number of open files.
+
+Only avaliable on Linux.
+.TP
 .B \-i \fIinterface\fP
 Specify network interface to bind.
 .TP
diff --git a/man/ss-tunnel.1 b/man/ss-tunnel.1
index 35fd992f..a4116284 100644
--- a/man/ss-tunnel.1
+++ b/man/ss-tunnel.1
@@ -35,7 +35,7 @@ ss-tunnel \- shadowsocks tools for local port forwarding, libev port
     [\fB\-s\fR \fIserver_host\fR] [\fB\-p\fR \fIserver_port\fR]    [\fB\-l\fR \fIlocal_port\fR]
     [\fB\-k\fR \fIpassword\fR]    [\fB\-m\fR \fIencrypt_method\fR] [\fB\-f\fR \fIpid_file\fR]
     [\fB\-t\fR \fItimeout\fR]     [\fB\-c\fR \fIconfig_file\fR]    [\fB\-i\fR \fIinterface\fR]
-    [\fB\-b\fR \fIlocal_addr\fR]  [\fB\-a\fR \fIuser_name\fR]
+    [\fB\-b\fR \fIlocal_addr\fR]  [\fB\-a\fR \fIuser_name\fR]      [\fB\-n\fR \fInofile\fR]
     [\fB\-L\fR \fIaddr\fR:\fIport\fR]
 
 .SH DESCRIPTION
@@ -81,6 +81,11 @@ Set the socket timeout in seconds. The default value is 10.
 .B \-c \fIconfig_file\fP
 Use a configuration file.
 .TP
+.B \-n \fInofile\fP
+Specify max number of open files.
+
+Only avaliable on Linux.
+.TP
 .B \-i \fIinterface\fP
 Specify network interface to bind.
 .TP