diff --git a/docs/retail_versions.md b/docs/retail_versions.md
index d6d27741d8..61162eda53 100644
--- a/docs/retail_versions.md
+++ b/docs/retail_versions.md
@@ -82,7 +82,7 @@ void foo() {
     make setup -jN
     ```
 
-    if necessary.
+    if necessary, where `N` is the number of cores on your machine.
 
 1.  Build the non-matching test ROM by running