diff --git a/i_o-q3-readme b/i_o-q3-readme
index 6eddb2ee..e0d9b175 100644
--- a/i_o-q3-readme
+++ b/i_o-q3-readme
@@ -9,3 +9,5 @@ optional and off by default.
 
 The map editor isn't included, get a modern copy from here:
 http://www.qeradiant.com/
+
+cd code/unix && make