diff --git a/README.md b/README.md
index 27119ea..43809ba 100644
--- a/README.md
+++ b/README.md
@@ -142,7 +142,7 @@ is written down here rather than reconstructed a third time.
 export MESH_LAB_HOST_BINARY=<mesh-host>/mesh-host
 export MESH_LAB_BUNDLE=<mesh-host>/examples/substrate-first-node.lock
 export MESH_LAB_MODULES=<mesh-control>/examples/modules
-export MESH_LAB_BUILDER=<mesh-control>/mesh-builder
+export MESH_LAB_BUILDER=<mesh-control>/build/mesh-builder   # build/, which is git-ignored
 
 # Built with `go build -o <path> ./examples/<name>` in mesh-control.
 export MESH_LAB_PROVISIONER=<somewhere>/postgres-provisioner