diff --git a/ports/nrf/README.md b/ports/nrf/README.md
index 22bb4af514..0341cd81cd 100644
--- a/ports/nrf/README.md
+++ b/ports/nrf/README.md
@@ -62,8 +62,9 @@ By default, the PCA10040 (nrf52832) is used as compile target. To build and flas
 
 Alternatively the target board could be defined:
 
-     make BOARD=pca10040
-     make BOARD=pca10040 deploy
+    make submodules
+    make BOARD=pca10040
+    make BOARD=pca10040 deploy
 
 ## Compile without LTO enabled