Document new --files-dir option

README.md

@@ -7,14 +7,17 @@ Is this a bad idea? Si!
 ## Command-Line Options
 
 * `--command`\
-  Command to expose (can be used multiple times). The command base name is used as the command name.
+  Command to expose (can be used multiple times). The command base name is used as the command name
 
 * `--basic-auth-user`\
   Username for basic http authentication
 
 * `--basic-auth-pass`\
   Password for basic http authentication
 
+* `--files-dir`\
+  Path to directory to serve files under `/files` route
+
 * `--listen-host`\
   Specifies the host to listen on\
   Default: `0.0.0.0`
@@ -79,3 +82,11 @@ curl -s -X POST -d '{"name":"ps", "args": ["-l"]}' http://10.0.0.1:3000/
   "stdout": "F S   UID     PID    PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD\n0 S  1001    3109    3046  0  80   0 -  3422 -      pts/1    00:00:01 zsh\n0 S  1001    9457    3109  0  80   0 - 326535 -     pts/1    00:00:00 go\n0 S  1001    9521    9457  0  80   0 - 288997 -     pts/1    00:00:00 main\n4 R  1001    9618    9521  0  80   0 -  2554 -      pts/1    00:00:00 ps\n"
 }
 ```
+
+### Serving Output Files
+
+If an exposed command generates files, you can expose a directory with the `--files-dir` option to make them available for download.
+
+```
+si --command /usr/bin/customscript --files-dir /tmp/outputdir
+```