Update README.md

gkorland · web-flow · commit 2708d09dc5e3 · 2020-05-25T16:26:08.000+03:00
diff --git a/README.md b/README.md
@@ -12,6 +12,10 @@
 
 ## Building
 
+Checkout submodules
+
+    git submodule update --init
+   
     cargo build
 
 On macOS:
