Document the gid and mode options.

README.md

@@ -9,11 +9,12 @@ owner can read files relative to a base directory.
 
 
 ```go
-http-faccess [-address addr] [-base dir] [-access log] [-error log]
+	http-faccess [-address addr] [-base dir] [-access log] [-error log]
+                 [-gid gid] [-mode mode]
 
-http-faccess -version
+	http-faccess -version
 
-http-faccess -help
+	http-faccess -help
 ```
 
 ### DESCRIPTION
@@ -211,6 +212,30 @@ file already exists at that path, then http-faccess fails to
 start. By default, http-faccess listens at port :7357.
 
 
+```go
+-gid groupid
+```
+
+Set the numeric group id of the socket file created when the server
+starts, if a Unix domain socket was specified by the -address
+option. Ignored if the server is listening at an IP address. If
+groupid is -1, then the gid of the socket file is not changed --
+this is the default.
+
+
+```go
+-mode mode
+```
+
+Set the permissions of the socket file created when the server
+starts, if a Unix domain socket was specified by the -address
+option. Ignored if the server is listening at an IP address. If the
+value of mode has a leading 0, it is interpreted as an octal
+number, so that the customary notation for permissions can be used
+(such as 0660). If mode is -1, the permissions of the socket file
+are not changed -- this is the default.
+
+
 ```go
 -access logfile
 ```

doc.go

@@ -33,6 +33,7 @@
 //
 // .
 //	http-faccess [-address addr] [-base dir] [-access log] [-error log]
+//                  [-gid gid] [-mode mode]
 //
 //	http-faccess -version
 //
@@ -211,6 +212,24 @@
 // file already exists at that path, then http-faccess fails to
 // start. By default, http-faccess listens at port :7357.
 //
+//	-gid groupid
+//
+// Set the numeric group id of the socket file created when the server
+// starts, if a Unix domain socket was specified by the -address
+// option. Ignored if the server is listening at an IP address. If
+// groupid is -1, then the gid of the socket file is not changed --
+// this is the default.
+//
+//	-mode mode
+//
+// Set the permissions of the socket file created when the server
+// starts, if a Unix domain socket was specified by the -address
+// option. Ignored if the server is listening at an IP address. If the
+// value of mode has a leading 0, it is interpreted as an octal
+// number, so that the customary notation for permissions can be used
+// (such as 0660). If mode is -1, the permissions of the socket file
+// are not changed -- this is the default.
+//
 //	-access logfile
 //
 // Write the server access log (in Common Log Format) to *logfile*, or