Update README with --admin-prefix info

README.md

@@ -19,6 +19,25 @@ Dockerfile available [here](https://git.seedno.de/seednode/roulette/raw/branch/m
 
 An example instance with most features enabled can be found [here](https://nature.seedno.de/).
 
+## Admin prefix
+You can restrict access to certain functionality by prepending a secret string to the paths.
+
+For example, providing the `--admin-prefix=abc123` flag will register the index rebuild path as `/abc123/index/rebuild`.
+
+The affected paths are:
+- `/debug/pprof/`
+- `/debug/pprof/cmdline`
+- `/debug/pprof/profile`
+- `/debug/pprof/symbol`
+- `/debug/pprof/trace`
+- `/extensions/available`
+- `/extensions/enabled`
+- `/index/html`
+- `/index/json`
+- `/index/rebuild`
+- `/types/available`
+- `/types/enabled`
+
 ## Filtering
 You can provide a comma-delimited string of alphanumeric patterns to match via the `include=` query parameter, assuming the `-f|--filter` flag is enabled.
 
@@ -113,12 +132,14 @@ Usage:
   roulette <path> [path]... [flags]
 
 Flags:
+      --admin-prefix string   string to prepend to administrative paths
   -a, --all                   enable all supported file types
       --audio                 enable support for audio files
   -b, --bind string           address to bind to (default "0.0.0.0")
       --case-sensitive        use case-sensitive matching for filters
       --code                  enable support for source code files
       --code-theme string     theme for source code syntax highlighting (default "solarized-dark256")
+      --concurrency int       maximum concurrency for scan threads (default 1024)
       --disable-buttons       disable first/prev/next/last buttons
       --exit-on-error         shut down webserver on error, instead of just printing the error
       --fallback              serve files as application/octet-stream if no matching format is registered