diff --git a/README.md b/README.md
index dea61dd..b453b0a 100644
--- a/README.md
+++ b/README.md
@@ -82,8 +82,12 @@ Similarly, you can stop the service with:
 ./xrxs-srv.sh stop
 ```
 
+You can add `-d` to either the `xrxs` command line or the `xrxs-srv.sh` command line to enable chatty `9p` debug output.
+
 ### client
 
-From the `uxn-client` directory, run `./build.sh` to compile the ROM and `./uxn-xrxs.sh` to mount the `9p` service and run the 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.
+
+When the ROM has been built, run `./uxn-xrxs.sh` to mount the `9p` service and run the client.
 
 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.
diff --git a/uxn-client/build.sh b/uxn-client/build.sh
index e12f17c..7b87175 100755
--- a/uxn-client/build.sh
+++ b/uxn-client/build.sh
@@ -2,4 +2,6 @@
 
 rm xrxs.rom 2>/dev/null
 uxnasm xrxs.tal xrxs.rom
-uxnemu xrxs.rom
\ No newline at end of file
+if [ "$1" = "-r" ]; then
+  uxnemu xrxs.rom
+fi