diff --git a/README.md b/README.md
index b453b0a..6685458 100644
--- a/README.md
+++ b/README.md
@@ -86,8 +86,14 @@ You can add `-d` to either the `xrxs` command line or the `xrxs-srv.sh` command
 
 ### client
 
-From the `uxn-client` directory, run `./build.sh` to compile the ROM. If you're working on the ROM with some local test files, not over 9p, you can also add the `-r` flag to run after building without starting the `9p` client.
+There are two versions of the client ROM. One is the normal `xrxs` client, and one is a standalone client for use as a generic `uxn` bootloader. The latter reads a ROM list out of a file called `index`, and appends the `.rom` extension to your selection and loads a file so named. Note that while the `9p` filesystem will be located under the parent directory of `./n`, the standalone bootloader assumes a flat filesystem.
 
-When the ROM has been built, run `./uxn-xrxs.sh` to mount the `9p` service and run the client.
+You can run `./build.sh` with no options to build the normal `xrxs` client, or with any of the following options:
 
-Both scripts assume you have `uxnasm` and `uxnemu` in your `PATH` respectively. `9pfuse` is used to mount the service, but other implementations could possibly be used.
+  * `-r`: build the normal client and run it for local testing (don't mount the remote `9p` filesystem)
+  * `-l`: build the standalone bootloader
+  * `-lr`: build the standalone bootloader and run it
+
+When the client ROM has been built, run `./uxn-xrxs.sh` to mount the `9p` service and run the client.
+
+The scripts assume you have `uxnasm` and `uxnemu` in your `PATH`. `9pfuse` is used to mount the service, but other implementations could possibly be used.
diff --git a/uxn-client/build.sh b/uxn-client/build.sh
index 7b87175..3249ff6 100755
--- a/uxn-client/build.sh
+++ b/uxn-client/build.sh
@@ -1,7 +1,15 @@
 #!/bin/sh
 
 rm xrxs.rom 2>/dev/null
-uxnasm xrxs.tal xrxs.rom
-if [ "$1" = "-r" ]; then
+
+if [ "$1" = "-l" ]; then
+  uxnasm xrxs-local.tal xrxs.rom
+elif [ "$1" = "-lr" ]; then
+  uxnasm xrxs-local.tal xrxs.rom
   uxnemu xrxs.rom
+else
+  uxnasm xrxs.tal xrxs.rom
+  if [ "$1" = "-r" ]; then
+    uxnemu xrxs.rom
+  fi
 fi