diff --git a/examples/sw/benchmarks/README.md b/examples/sw/benchmarks/README.md
index 49bebb6aa3..e74d9b0898 100644
--- a/examples/sw/benchmarks/README.md
+++ b/examples/sw/benchmarks/README.md
@@ -11,9 +11,12 @@ All of these benchmarks run on Simple System. A verilator simulation suitable
 for running them can be built with:
 
 ```
-fusesoc --cores-root=. run --target=sim --setup --build lowrisc:ibex:ibex_simple_system --RV32E=0 --RV32M=ibex_pkg::RV32MFast
+fusesoc --cores-root=. run --target=sim --setup --build lowrisc:ibex:ibex_simple_system `./util/ibex_config.py maxperf fusesoc_opts`
 ```
 
+Where 'maxperf' is a particular Ibex configuration.
+These are specified in the `ibex_configs.yaml` file.
+
 See examples/simple_system/README.md for full details.
 
 ## CoreMark