diff --git a/README.md b/README.md
index 0826983..0df0704 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ The common cmake tasks are wpilibcSim, frc_gazebo_plugins, and gz_msgs
 ```bash
 mkdir build #run this in the root of allwpilib
 cd build
-cmake ..
+cmake -DSIMULATION_INSTALL_DIR=$PWD/install/simulation ..
 make
 ```